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g4 (a4)
3步杀：兵到f6 (e5)
3步杀：后到c6 (d7)
3步杀：后到c1
3步杀：车到d7 (d6)
3步杀：后到h7 (h4·2)
3步杀：兵到b3
3步杀：车到a2
3步杀：后到h7 (h8)
2步杀：象到d4 (f2)
3步杀：后到e8 (g8)
3步杀：后到e8 (b8·2)
3步杀：兵到b8 (b7)
3步杀：象到e4
3步杀：后到d5 (g2)
2步杀：车到f4
3步杀：象到e6 (b3)
3步杀：象到f6 (e5·2)
3步杀：后到c7 (d8)
3步杀：后到c5 (c4)
3步杀：象到f4 (e5)
3步杀：车到d7 (c7)
3步杀：后到f5 (c2)
3步杀：象到e3
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