Chess960 战术题：天梯杀
两个重子一线一线地推进，切断所有退路。
1518 道题
3步杀：后到b6 (e3·2)
3步杀：后到b7 (a8·2)
3步杀：象到d6 (c7)
攻击未易位的王：车到e7 (h7)
3步杀：马到f6 (g4)
3步杀：车到a7 (b7·4)
3步杀：车到f5 (f1·2)
3步杀：后到e6 (b3·5)
3步杀：车到h7 (h4)
3步杀：后到f7 (e6·3)
3步杀：车到c7 (c6)
3步杀：车到b7 (c7·2)
3步杀：后到f7 (h5·2)
3步杀：车到b7 (b3·2)
3步杀：马到c6 (b4·2)
3步杀：车到d7 (g7)
3步杀：车到d5 (c5)
3步杀：象到c6 (h1·2)
3步杀：车到c8 (d8·2)
3步杀：后到b5 (b4·3)
3步杀：象到h7
3步杀：车到b7 (d7·2)
3步杀：车到c6 (c4)
3步杀：后到d7 (f7·2)
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