Make the run to the net and back a double tap

Oliver: "das Vorlaufen und Zurücklaufen sollte durch einen Doppeltipp
ausgelöst werden". It replaces v374's flick-length rule: the long
up-flick is only the deep ball again, the long down-flick only the lob.

While his own ball flies there is nothing to hit, so a tap there is not
a swing. Two inside 0.35 s take him in to the net from the back, or back
from the net. "TO THE NET" or "BACK" pops under him. An incoming ball
keeps every tap a swing, so the two meanings never share a moment. After
his own serve it is serve and volley. The short-ball approach stays
automatic.

Measured: the base ladder is unchanged, and following the ball in still
pays against pushers and costs against big hitters. Three tests replace
v374's two; v376.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

PROJECT.md

@@ -5709,6 +5709,33 @@ flipping by metres, every other frame, between two candidates:
   200 ms. The old code makes 26. The early-tap test's floor moved 0.45 → 0.42: he now stops 0.12 m from his
   mark instead of 0.35, so contact comes a hair later. The old curve still reads 0.33.
 
+### The run in and out is a DOUBLE TAP (2026-10-14, v376)
+Oliver on v375: *"das Vorlaufen und Zurücklaufen sollte durch einen Doppeltipp ausgelöst werden"*. It
+replaces v374's flick-length rule. The shot and the run are separate decisions now: the long up-flick is
+only the deep hard ball, the long down-flick only the lob.
+- **While his OWN ball flies** (rally modes, `ball.lastHit === 'P'`) there is nothing to hit, so a tap there
+  is not a swing at all. Two taps inside `dblTap` (0.35 s) are `moveCall`: from the back to the net
+  (`ball.approach = 'P'`), from the net (or while already running in) back (`ball.retreat`). A word pops
+  under him ("TO THE NET" / "BACK"). A single tap there does nothing (it used to be a pointless swish).
+- **An incoming ball keeps every tap a swing**, so the two meanings never share a moment. The rule from
+  the 2026-08-22 lob holds: the meaning depends on whose ball is in the air, which he always knows, never
+  on where the opponent stands.
+- **After his own serve it is serve and volley.** `P.rushing` no longer excludes the serve. His reply is a
+  net man's plan from wherever his run has got to.
+- **The short-ball approach stays automatic** (step 1, decision (c)). A double tap during that run takes him
+  back.
+- Input: a tap fires at lift if under 250 ms (input.js), and the canvas has `touch-action: none`, so the
+  browser's double-tap zoom never sees it.
+- Measured (σ60, level 26, 8 seeds; the bot follows 30% of its deep flicks in with a double tap): the base
+  ladder is unchanged. Attacking still pays against the pushers (Steward 52 → 61) and costs against the big
+  hitters and the Champion (Brute 29 → 20, Champion 33 → 25). It is a little weaker than v374's, because he
+  sets off after the shot, not with it.
+- Tests (172): a double tap from the back takes him in, one tap or two too far apart do nothing and never
+  swing, the long up-flick alone no longer runs; a double tap at the net takes him back, the lob alone does
+  not; an incoming ball keeps both taps swings.
+- **Not built:** a lesson for it. The ghost hand teaches the tap and the side flick only; the double tap
+  is undiscoverable without being told. Add one if the phone test says so.
+
 # OPEN — leftovers, in rough priority order
 
 Nothing here is broken; these are known gaps and unverified risks.
@@ -5723,7 +5750,8 @@ Nothing here is broken; these are known gaps and unverified risks.
    v374 adds the player's own net game: long up-flick = attack and follow in, long down-flick = lob and
    go back, and the SMASH. See "The player's way to the net and back" above.
    v375: the auto-run's shake is gone (a latched chase plan); he is a little stronger for it, so the bottom
-   of the Climb and classic easy may now be too easy. See "The auto-run stops shaking". Fallback tag `rally-baseline-v360`.
+   of the Climb and classic easy may now be too easy. See "The auto-run stops shaking".
+   v376: the run to the net and back is a DOUBLE TAP while his own ball flies (replaces v374's flick length). Fallback tag `rally-baseline-v360`.
 
 1. **`RES` 4 is unverified on a real phone under load.** It nearly doubled the fill rate (810 -> 1080
    device px across). Oliver has not reported stutter, but he also has not played a late horde since.

index.html

@@ -1140,6 +1140,6 @@ if (location.hostname !== 'splatter-tennis.wuwi.one' && !window.Capacitor?.isNat
   </div>
 </div>
 <span id="recLamp" hidden>REC</span>
-<script type="module" src="src/main.js?v=375"></script>
+<script type="module" src="src/main.js?v=376"></script>
 </body>
 </html>

src/config.js

@@ -107,9 +107,7 @@ export const TUNE = {
   softErr: 0.8,            // ...and how far toward it at quality 0
   lobTurn: 0.6,            // leg speed of an opponent lobbed at the net: he turns and backpedals
   netReact: 0.22,          // s an opponent at the net stands reading the pass before he moves
-  attackMin: 90,           // px: an UP-flick this long is the ATTACK — the deep ball and you follow it to the
-                           // net (shorter: the deep ball, you stay). Mirror of dropMax: a long DOWN-flick is
-                           // the lob and takes you back to the baseline. One meaning each, wherever you stand
+  dblTap: 0.35,            // s: two taps this close while his OWN ball flies are the move — to the net, or back
   smashMinY: 1.9,          // m: a ball the player takes OUT OF THE AIR at least this high is a SMASH...
   smashMaxY: 2.5,          // ...up to this high (above CONTACT.maxY: the overhead reaches higher than a volley —
                            // but under the 2.8 m the opponent's lob clears a net man by, or he smashes it standing)

src/gameplay.js

@@ -393,13 +393,7 @@ function doHit(ch, quality, aim) {
   // Never against a man already at the net — that ball is a PASS, and two volleyers is the old
   // reflex duel at a quarter of a second per shot. ball.from is the striker's distance from the net.
   ball.approach = rallyFeel() && ball.rx && ball.rx.short && !(ball.from < TUNE.netFrom) ? ch.side : null;
-  // THE PLAYER'S OWN WAY IN AND OUT (2026-10-14, Oliver: "Steuerung ans Netz gehen"). A LONG up-flick
-  // is the attack: the deep ball, and he follows it in — even onto a man at the net, it is his call.
-  // A long DOWN-flick is the lob, and he goes back behind it. Gesture length only, never context: the
-  // 2026-08-22 lob taught that a gesture whose meaning depends on where the opponent stands is noise.
-  const longFlick = aim && (aim.mag === undefined || aim.mag >= TUNE.attackMin);
-  if (ch.side === 'P' && rallyFeel() && aim && aim.az < 0 && !aim.smash && longFlick) ball.approach = 'P';
-  ball.retreat = ch.side === 'P' && rallyFeel() && soft !== null && soft >= 1 ? 'P' : null;
+  ball.retreat = null; // his own way back is a DOUBLE TAP while this ball flies (moveCall), never the shot
   ball.smash = !!(aim && aim.smash);
   ball.from = Math.abs(ch.z - COURT.netZ);
   ball.lastHit = ch.side; ball.bounces = 0; ball.rx = null; // a new shot: the receiver plans it afresh
@@ -2139,6 +2133,15 @@ export function keyPressed(code, lead = 0, flick = false) {
     hitServe(P, q, sway || hard ? { sx: sway, hard } : null);
     return;
   }
+  // THE DOUBLE TAP IS HIS LEGS (2026-10-14, Oliver: "das Vorlaufen und Zurücklaufen sollte durch einen
+  // Doppeltipp ausgelöst werden"). While his OWN ball is flying there is nothing to hit, so a tap there is
+  // not a swing: two inside dblTap are the move — in to the net from the back, back from the net. An
+  // incoming ball keeps every tap a swing, so the two meanings never share a moment. (v374 put this on the
+  // flick's length; the shot and the run are separate decisions now.)
+  if (rallyFeel() && G.phase === 'rally' && ball.active && ball.lastHit === 'P' && !flick) {
+    if (G.moveTapT > 0) { G.moveTapT = 0; moveCall(); } else G.moveTapT = TUNE.dblTap;
+    return;
+  }
   if (G.phase === 'rally' && P.swingT < 0) {
     recordEvent('swing', { window: TUNE.swingWindow * winLevel(), assist: assistK(), lead });
     // A TAP COUNTS FROM THE MOMENT THE FINGER LANDS (rally modes). A tap is only known to BE a tap
@@ -2156,6 +2159,16 @@ export function keyPressed(code, lead = 0, flick = false) {
   }
 }
 
+// In to the net, or back from it: the double tap's one meaning is "the other end of my half". At the net
+// (or already running in) it is the way back; anywhere else it is the way in. rallyHome reads the flags
+// while his ball flies, the run goes at full pace, and his reply is planned from wherever he has got to.
+function moveCall() {
+  const goingIn = ball.approach === 'P' || (Math.abs(P.z - COURT.netZ) < TUNE.netFrom && ball.retreat !== 'P');
+  ball.approach = goingIn ? null : 'P';
+  ball.retreat = goingIn ? 'P' : null;
+  popText(P.x, 0, P.z + TUNE.praiseBehind, goingIn ? 'BACK' : 'TO THE NET', UI.warm, true);
+}
+
 function expirePose(ch, dt) {
   if (ch.pose === 'swing' || ch.pose === 'serve') { ch.poseT += dt; if (ch.poseT > POSE_TIME) ch.pose = 'idle'; }
 }
@@ -2225,6 +2238,7 @@ function mopRound(b, dt) {
 // ---------------------------------------------------------------- update ----
 export function update(dt) {
   recordFrame(dt);
+  if (G.moveTapT > 0) G.moveTapT -= dt; // the double tap's window (keyPressed)
   if (G.hitstop > 0) { G.hitstop -= dt; return; }
   // THE OTHER ENDING: a classic match played out. The world holds still — the man is standing, the
   // crowd is still clapping it down — and the only thing running is the clock the summary and its
@@ -2353,7 +2367,7 @@ export function update(dt) {
       // ...and lobbed at the net he backpedals, exactly as slowly as the CPU does (TUNE.lobTurn)
       // HIS OWN WAY IN AND OUT runs at full pace (the attack's follow-in, the lob's retreat), and while
       // his attack flies he is RUSHING: the reply is planned as a net man's from wherever he has got to
-      if (ball.lastHit === 'P') P.rushing = ball.approach === 'P' && !G.wasServe;
+      if (ball.lastHit === 'P') P.rushing = ball.approach === 'P'; // a double tap behind his serve is serve and volley
       const ownRun = !chasing && rallyFeel() && ball.lastHit === 'P' && (ball.approach === 'P' || ball.retreat === 'P');
       let rate = TUNE.playerSpeed * aK * dt * (chasing || ownRun ? 1 : 0.55) * (chasing && ball.rx && ball.rx.lob ? TUNE.lobTurn : 1);
       // ON HIS HEELS: a put-away of his own sitter is read late (step 4 (b)). Without this the auto-run

src/state.js

@@ -184,6 +184,7 @@ export const G = {
   rallyNear: null,    // closest the incoming ball got this rally (for never-swung passes)
   swung: false,       // player swung at least once this rally — whiff log supersedes PASSED
   lastMiss: null,     // {text, at} — most recent miss reason, drawn on the HUD briefly
+  moveTapT: 0,        // the double tap's open window (gameplay.keyPressed, moveCall)
   ring: null,         // the drawn gold ring's steady cue (gameplay update smooths ringCue)
   logShow: false,     // tap the scoreboard to toggle the on-screen miss-log dump
 };

test.js

@@ -1521,11 +1521,11 @@ test('LOBBED at the net, the player backpedals too, and only blocks it back', ()
   } finally { TUNE.autoAssist = assist; }
 });
 
-// ---- THE PLAYER'S WAY TO THE NET AND BACK, AND THE SMASH (2026-10-14, Oliver: "Steuerung ans Netz gehen"
+// ---- THE PLAYER'S WAY TO THE NET AND BACK (the double tap), AND THE SMASH (2026-10-14, Oliver: "Steuerung ans Netz gehen"
 // ... "wenn man einen Lob vom Gegner als Volley annimmt, soll man derb schmettern") ---------------------
 // One player shot with a given swipe from (x 0, z pz), then `secs` of flight with the opponent parked out
 // of play. Returns the shot's flags and where the player's own run took him.
-function ownShot(swipe, pz, secs = 1.2) {
+function ownShot(swipe, pz, secs = 1.2, taps = []) {
   freshSplatter(); startMatch(); G.interlude.introT = 0;
   const assist = TUNE.autoAssist; TUNE.autoAssist = 1.15;
   try {
@@ -1538,30 +1538,55 @@ function ownShot(swipe, pz, secs = 1.2) {
     G.swipe = swipe;
     update(DT); G.swipe = null;
     assert.equal(ball.lastHit, 'P', 'the swing connects');
-    const out = { approach: ball.approach, retreat: ball.retreat };
-    for (let i = 0; i < secs * 60 && ball.active; i++) { rz.swingCool = 999; update(DT); }
-    out.fromNet = Math.abs(P.z - COURT.netZ);
-    return out;
+    let swung = false;
+    for (let i = 0; i < secs * 60 && ball.active; i++) {
+      rz.swingCool = 999;
+      if (taps.includes(i)) { keyPressed('Space', 0.1); swung ||= P.swingT >= 0; }
+      update(DT);
+    }
+    return { approach: ball.approach, retreat: ball.retreat, fromNet: Math.abs(P.z - COURT.netZ), swung };
   } finally { TUNE.autoAssist = assist; }
 }
 
-test('THE ATTACK: a long up-flick follows the ball to the net, a short one stays back', () => {
-  const up = mag => ({ ax: 0, az: -1, fx: 0, fy: -1, mag });
-  const attack = ownShot(up(TUNE.attackMin + 30), 24), deep = ownShot(up(TUNE.attackMin - 30), 24);
-  assert.equal(attack.approach, 'P', 'the long up-flick is the attack');
-  assert.ok(attack.fromNet < TUNE.netFrom, `...and he is at the net by the time it gets there: ${attack.fromNet.toFixed(1)} m`);
-  assert.equal(deep.approach, null, 'the short one is the deep ball');
-  assert.ok(deep.fromNet > TUNE.netFrom + 3, `...and he stays back: ${deep.fromNet.toFixed(1)} m`);
+test('THE DOUBLE TAP is his legs: from the back it takes him to the net, a single tap does nothing', () => {
+  // Oliver, 2026-10-14: "das Vorlaufen und Zurücklaufen sollte durch einen Doppeltipp ausgelöst werden".
+  // While his own ball flies there is nothing to hit, so taps there are the move, never a swing.
+  const deep = { ax: 0, az: -1, fx: 0, fy: -1, mag: TUNE.flickFull + 20 };
+  const plain = ownShot(deep, 24), one = ownShot(deep, 24, 1.2, [6]), two = ownShot(deep, 24, 1.2, [6, 6 + 10]);
+  assert.equal(plain.approach, null, 'a long up-flick is only a shot now: no run');
+  assert.ok(plain.fromNet > TUNE.netFrom + 3, `...he stays back: ${plain.fromNet.toFixed(1)} m`);
+  assert.ok(!one.swung && one.approach === null && one.fromNet > TUNE.netFrom + 3, 'one tap while his ball flies: nothing at all');
+  assert.equal(two.approach, 'P', 'the double tap is the way in');
+  assert.ok(!two.swung, '...and neither tap swung');
+  assert.ok(two.fromNet < TUNE.netFrom, `...and he is at the net by the time the ball gets there: ${two.fromNet.toFixed(1)} m`);
+  const slow = ownShot(deep, 24, 1.2, [6, 6 + Math.ceil(TUNE.dblTap * 60) + 3]);
+  assert.equal(slow.approach, null, 'two taps further apart than dblTap are not a double tap');
 });
 
-test('THE WAY BACK: a long down-flick from the net is the lob, and he goes back behind it; a drop keeps the net', () => {
-  const down = mag => ({ ax: 0, az: 1, fx: 0, fy: 1, mag });
-  const lob = ownShot(down(TUNE.flickFull + 20), COURT.netZ + TUNE.netStand, 2);
-  const drop = ownShot(down(TUNE.dropMax - 30), COURT.netZ + TUNE.netStand, 1);
-  assert.equal(lob.retreat, 'P', 'the lob is the way back');
-  assert.ok(lob.fromNet > TUNE.netFrom, `...and he is back behind the net zone: ${lob.fromNet.toFixed(1)} m`);
-  assert.equal(drop.retreat, null, 'a drop volley is not a retreat');
-  assert.ok(drop.fromNet < TUNE.netFrom, `...he holds the net: ${drop.fromNet.toFixed(1)} m`);
+test('THE DOUBLE TAP at the net is the way back; a long down-flick is only the lob', () => {
+  const down = { ax: 0, az: 1, fx: 0, fy: 1, mag: TUNE.flickFull + 20 };
+  const lob = ownShot(down, COURT.netZ + TUNE.netStand, 1.5);
+  assert.equal(lob.retreat, null, 'the lob alone does not take him back');
+  assert.ok(lob.fromNet < TUNE.netFrom, `...he holds the net: ${lob.fromNet.toFixed(1)} m`);
+  const back = ownShot(down, COURT.netZ + TUNE.netStand, 1.5, [6, 14]);
+  assert.equal(back.retreat, 'P', 'the double tap at the net is the way back');
+  assert.ok(back.fromNet > TUNE.netFrom, `...and he is back behind the net zone: ${back.fromNet.toFixed(1)} m`);
+});
+
+test('an INCOMING ball keeps every tap a swing: the double tap never eats a shot', () => {
+  freshSplatter(); startMatch(); G.interlude.introT = 0;
+  oppOf().swingCool = 999;
+  G.phase = 'rally'; G.wasServe = false;
+  const v = solveShot(0, 1, 2, 0.5, 21, 20);
+  Object.assign(ball, { active: true, scored: false, lastHit: 'O', bounces: 0, rx: null, spin: 1, soft: false,
+    x: 0, y: 1, z: 2, vx: v.vx, vy: v.vy, vz: v.vz, g: TUNE.gravity });
+  P.swingT = -1;
+  keyPressed('Space', 0.1);
+  assert.ok(P.swingT >= 0, 'the first tap swings');
+  P.swingT = -1;
+  keyPressed('Space', 0.1);
+  assert.ok(P.swingT >= 0, 'and so does the second');
+  assert.equal(ball.approach, null, 'no run was called');
 });
 
 test('THE SMASH: a lob taken out of the air is struck hard to the open court; a deep lob still beats him', () => {

tools/rally-sim.mjs

@@ -93,7 +93,7 @@ const med = a => { const s = [...a].sort((x, y) => x - y); return s.length ? s[M
 // 120 ms tap), and plays the game a little — a lob or a pass against a net man, the odd drop when
 // the opponent hangs back. BOT=dist is the original fixed-distance tapper with random flicks.
 const HUMAN = (process.env.BOT || 'human') === 'human';
-const ATTACK = Number(process.env.ATTACK || 0); // share of baseline shots played as the attack (long up-flick)
+const ATTACK = Number(process.env.ATTACK || 0); // share of baseline shots followed in: a deep flick, then a DOUBLE TAP
 const JIT = Number(process.env.JIT ?? 60) / 1000, LAG = 7;
 const gauss = () => Math.sqrt(-2 * Math.log(1 - Math.random())) * Math.cos(2 * Math.PI * Math.random());
 const netx = { attacks: 0, smash: 0, smashWon: 0, lobbed: 0, open: null, p0: 0 };
@@ -108,7 +108,7 @@ function humanAim() {
   const away = rz && rz.x > 0 ? -1 : 1;                          // the side he is not on
   if (oz < TUNE.netFrom) return r < 0.4 ? sw(0, 1, 150) : sw(away, -0.3, 120);  // net man: lob him or pass him
   if (oz > COURT.netZ + 0.5 && Math.abs(P.z - COURT.netZ) < COURT.netZ - 1.5 && r < 0.15) return sw(0, 1, 50); // drop
-  if (ATTACK && Math.abs(P.z - COURT.netZ) >= TUNE.netFrom && r < ATTACK) return sw(away * 0.3, -1, 130); // the attack: follow it in
+  if (ATTACK && Math.abs(P.z - COURT.netZ) >= TUNE.netFrom && Math.random() < ATTACK) { bot.dbl = true; return sw(away * 0.3, -1, 130); } // the attack
   if (r < 0.45) return sw(away, -0.2, 110);                      // to the open side
   if (r < 0.65) return sw(0, -1, 80);                            // deep through the middle
   return null;                                                   // a plain tap
@@ -162,6 +162,8 @@ for (const rung of RUNGS) {
         }
       }
       if (i === bot.fire) { G.swipe = bot.swipe; keyPressed('Space', bot.swipe ? 0 : LAG / 60, !!bot.swipe); }
+      if (bot.dbl && ball.lastHit === 'P' && ball.active) { bot.dbl = false; bot.taps = [i + 4, i + 12]; } // follow it in: the double tap
+      if (bot.taps && bot.taps.includes(i)) keyPressed('Space', 0.1);
     }
     else if (G.phase === 'rally' && ball.active && ball.lastHit === 'O') {
       const d = Math.hypot(ball.x - P.x, (ball.z - P.z) * 0.8);
@@ -178,7 +180,9 @@ for (const rung of RUNGS) {
     const px0 = P.x, pz0 = P.z, tg0 = P.tgt;
     if (process.env.PROBE && lh === 'O' && bot.land && P.swingT >= 0) bot.land.sw = P.swingT, bot.land.d = Math.hypot(ball.x - P.x, (ball.z - P.z) * 0.8), bot.land.y = ball.y, bot.land.bb = ball.bounces;
     update(DT);
-    if (lh !== 'P' && ball.lastHit === 'P' && ball.active) { if (ball.approach === 'P' && !G.wasServe) netx.attacks++; if (ball.smash) { netx.smash++; netx.open = 'smash'; } }
+    if (lh !== 'P' && ball.lastHit === 'P' && ball.active && ball.smash) { netx.smash++; netx.open = 'smash'; }
+    if (ball.lastHit === 'P' && ball.approach === 'P' && !netx.wasIn) netx.attacks++; // a run in (the double tap, or a short ball)
+    netx.wasIn = ball.lastHit === 'P' && ball.approach === 'P';
     if (lh === 'P' && ball.lastHit === 'O' && ball.active && ball.soft && Math.abs(P.z - COURT.netZ) < TUNE.netFrom) netx.lobbed++;
     if (netx.open && (G.phase !== 'rally' || !ball.active)) { const d0 = score.pts[0] - netx.p0; if (d0 > 0) netx.smashWon++; netx.open = null; }
     if (netx.open === null) netx.p0 = score.pts[0];