feedback6: merge R21A — 突袭 may land on a teammate's half when both halves are occupied (two-helper 联防, Final Assault / Hidden Core pair; the owner's decision of 2026-10-07), Battle.onFieldBoard; DESIGN §26 / §26.1 (docs/history/0.2.1.md); golden as R21A's commit (boss-boss_2/3/4/5/6-pair, hidden-boss_8/10-pair, coop4-ABYSS-7)

server/sim/battle/players.js

@@ -78,9 +78,9 @@ export class BattlePlayers {
    * Whether field tile (r, c) lies on player `ps`'s own board: the board region GEO.FIELD (rows 9–12, cols 2–10, the
    * tiles its pieces are deployed on) mapped onto this field — the 联防 right-hand helper's +8 columns, the boss field's
    * rows 2–5, the mirrored right half of a pair (whatever coordinates the player's input uses). Never the hand / 临时
-   * 整备区 rows of a boss field (rows 0–1, inside BOSS_RECT) nor the other half of a 联防 or boss field. Automatic
-   * redeployments and moves that must stay where the player could deploy read it (the 突袭 landing, bonds/addon/battle.js
-   * raidTile; 乌尔比安's S3 【移动】, kits/ops/chess_char_5_05-ulpia.js).
+   * 整备区 rows of a boss field (rows 0–1, inside BOSS_RECT) nor the other half of a 联防 or boss field. Moves that must
+   * stay where the player could deploy read it (乌尔比安's S3 【移动】, kits/ops/chess_char_5_05-ulpia.js); the 突袭
+   * landing reads onFieldBoard (any player of this field).
    */
   onOwnBoard(ps, r, c) {
     if (!ps) return false;
@@ -94,6 +94,18 @@ export class BattlePlayers {
     return keys.has(r * COLS + c);
   }
 
+  /**
+   * Whether field tile (r, c) lies on the board of a player standing on this field: onOwnBoard of one of `players`,
+   * the players whose units this battle holds (a teammate eliminated before it or playing another field is not one).
+   * Both halves on the two-helper 联防 field and on a Final Assault / Hidden Core pair field; the own half only for a
+   * lone 联防 helper and on a solo boss field; never a boss field's hand / 临时整备区 rows. The 突袭 landing reads it
+   * (bonds/addon/battle.js raidTile — the owner's decision of 2026-10-07, DESIGN §26.1).
+   */
+  onFieldBoard(r, c) {
+    for (const ps of this.players) if (this.onOwnBoard(ps, r, c)) return true;
+    return false;
+  }
+
   _boardTile(ps, row, col) {
     const bossLike = this.kind === 'boss' || this.kind === 'hidden';
     let r = row;

server/sim/content/bonds/addon/battle.js

@@ -33,8 +33,10 @@
 //   助力 deputShip     all operators DEF +(base + per·L), redeploy time ×(1 + respawn_time)
 //   突袭 raidShip      member idle ≥ no_attack_duration s (or skill ready — a passive skill that is on counts, GitHub
 //                      #49, and so does a deploy-timed skill while it runs, #109) with no enemy in range → "保留技力立即再部署"
-//                      next to the most advanced ground enemy it can reach: on a free tile of its own board (Battle.onOwnBoard:
-//                      never a boss field's hand / 临时整备区 rows, never the other half of a 联防 or boss field — community
+//                      next to the most advanced ground enemy it can reach: on a free tile of a board of its field
+//                      (Battle.onFieldBoard: its own or a teammate's on the same field — the two-helper 联防 field and a
+//                      pair field open both halves, the owner's decision of 2026-10-07; never a boss field's hand /
+//                      临时整备区 rows, never the empty other half of a lone 联防 helper or a solo boss field — community
 //                      reports of 2026-10-06, items 40 and 16.3) its position may be deployed
 //                      on from which its range covers that enemy (GitHub issue #51 [ASSUMED]: the first of the 8 most
 //                      advanced that has such a tile; none → it stays and the next poll looks again, never a jump that
@@ -271,10 +273,12 @@ function raidReach(u) {
 /**
  * Landing tile [row, col] of a jump to enemy `e`, or null: a tile from which the member's range (`reach`, raidReach)
  * covers the enemy's body (a huge enemy: any tile it occupies — body.js), within RAID_SEARCH tiles (Chebyshev) of the
- * enemy, inside the field rect and on the member's own board (Battle.onOwnBoard — "再部署" goes where its player deploys:
- * never a boss field's hand row 0 or 临时整备区 row 1, both inside BOSS_RECT and buildable high ground, nor the half of the
- * 联防 or boss field that is not its player's; community reports of 2026-10-06, items 40 and 16.3: a ranged member landed
- * on the 临时整备区 row of a solo leader round, and on the right half of the one-helper 联防 map), that the member's
+ * enemy, inside the field rect and on a board of its field (Battle.onFieldBoard — "再部署" goes where a player of the
+ * field deploys: its own board or a teammate's half when both halves are taken, the two-helper 联防 field and a pair
+ * field — the owner's decision of 2026-10-07, DESIGN §26.1; never a boss field's hand row 0 or 临时整备区 row 1, both
+ * inside BOSS_RECT and buildable high ground, nor the empty other half of the one-helper 联防 map or a solo boss field;
+ * community reports of 2026-10-06, items 40 and 16.3: a ranged member landed on the 临时整备区 row of a solo leader
+ * round, and on the right half of the one-helper 联防 map), that the member's
  * position may be deployed on (grid.canStand: never the 深水区 —
  * player report #3 after 0.1.0 —, and for a melee member low ground only, never a 高台: GitHub #148) and that is free
  * (Battle.isReservedTile: no living unit, no knocked-out operator's body — player report F5 —, no waiting piece's tile).
@@ -299,7 +303,7 @@ function raidTile(battle, u, e, reach) {
     for (let i = 0; i < reach.length; i += 2) {
       const r = br - reach[i], c = bc - reach[i + 1], dr = r - er, dc = c - ec;
       if (Math.abs(dr) > RAID_SEARCH || Math.abs(dc) > RAID_SEARCH) continue;
-      if (!battle.grid.inRect(r, c) || !battle.onOwnBoard(u.player, r, c) || !battle.grid.canStand(r, c, { ranged }) || battle.isReservedTile(r, c)) continue;
+      if (!battle.grid.inRect(r, c) || !battle.onFieldBoard(r, c) || !battle.grid.canStand(r, c, { ranged }) || battle.isReservedTile(r, c)) continue;
       const t = r * COLS + c;
       const p = path && battle.grid.tile(r, c).pass === 'ALL' && (path.has(t) || body.includes(t)) ? 0 : 1;   // its block applies
       const d = Math.max(Math.abs(dr), Math.abs(dc)) + 0.01 * (Math.abs(dr) + Math.abs(dc));

server/sim/content/kits/ops/chess_char_5_05-ulpia.js

@@ -95,9 +95,11 @@ export default {
           if (stop === 0 || !unit.alive) return;
           // PRTS 备注: landing tile > the tile one beyond it > his own tile (a deployable, free, unreserved melee tile).
           // "可部署" is a tile his player may deploy on: his own board (Battle.onOwnBoard) — never the other half of a 联防 or
-          // boss field nor a boss field's hand / 临时整备区 rows. Community report of 2026-10-06 (item 27) 「乌尔比安使用3技能会在
-          // 联防阶段跳到红门后」: on the one-helper 联防 map (escaped_single, enemies from the middle gate at col 10) an anchor that
-          // met no enemy flew on to the right half, where no enemy ever walks, and he moved there for the whole skill
+          // boss field nor a boss field's hand / 临时整备区 rows; a teammate's half stays closed to him even where the 突袭
+          // landing may take it (Battle.onFieldBoard, DESIGN §26.1). Community report of 2026-10-06 (item 27)
+          // 「乌尔比安使用3技能会在联防阶段跳到红门后」: on the one-helper 联防 map (escaped_single, enemies from the middle gate at
+          // col 10) an anchor that met no enemy flew on to the right half, where no enemy ever walks, and he moved there for
+          // the whole skill
           const ok = ([r, c]) => (r !== unit.tileR || c !== unit.tileC) && battle.grid.inRect(r, c) && battle.onOwnBoard(unit.player, r, c) && battle.grid.canStand(r, c) && !battle.grid.isObstacle(r, c) && !battle.isReservedTile(r, c);
           const dest = [[sr, sc], frontOf(unit.tileR, unit.tileC, unit.dir, stop + 1)].find(ok);
           if (dest == null) return;