牵制：马到g4
li-06Phg战术主题
引离：迫使防守的棋子离开岗位。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度2355 ShuffleRating——专家水平——很少有人一次解出。
黑方走棋——找出最佳续着
How to recognize this tactic
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
A pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
棋盘上的局面
白方：王 f2, 后 b3, 车 b7, 象 e2, 兵 h2 g3 e4 f4。
黑方：王 h8, 后 a1, 车 a2, 马 e5, 兵 d4 f6 h6 g7。
棋盘上有8枚白棋和8枚黑棋；该题局面出现在第34回合之后。
The position in numbers
Material is level — 21 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on f2, the black king on h8.
It is Black to move on move 34, with 33 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): a, b, c — natural highways for the rooks and queen. Half-open for Black: e.
The Black king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
解答与讲解
主要变着
34... Ng4+ 35. Kg2 Rxe2+
为何奏效
- 好棋！马到g4保持压力（+4.7）。
- 好棋！车到e2保持压力（+4.7）。
- 你赢得一子——象。
- 若改走Kg2，则Rxe2+，你赢得象。
Move by move
- 34… Ng4+ — 马 to g4 with check
- 35. Kg2 — 王 to g2
- Rxe2+ — 车 to e2 (capture) with check
本题的题型
围猎被牵制子
被牵制的子逃不掉——再次攻击它，把它拿下。
被牵制的棋子无法逃跑——这意味着只要再攻击它一次，就能整个赢下它。数一数攻击者和防守者：如果进攻方更多，这个子就是你的了。最好的「第二攻击者」是兵：它比它能吃到的任何东西都便宜。别急着立刻吃——先加强压力，然后再收割。
连将追击
步步将军——把王一路追到必败之地。
连将追击：你的每一步都是将军，对手连一秒钟都腾不出来实施自己的计划。国王被赶着满盘跑，直到丢子或撞上致命一击。这类变化最容易计算：每次将军，王只有寥寥几种应法——全部枚举即可。养成习惯：任何尖锐局面的计算都从将军开始，它们是棋盘上最强制的着法。
来源
源自 Lichess 题库（CC0）。
题包 015
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