胡海宇对许升第四轮对局。许升原名许信，新加坡象棋大师。
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几度 >>Can step 18 change from R9.2 to R6.4 !!!
Can step 18 change from R9.2 to R6.4
Black D4+5 , R9.2
If Black H8+9 , Red R4.1
if Black H7-8 , Red R 4+1
Black D4+5 , R9.2
If Black H8+9 , Red R4.1
if Black H7-8 , Red R 4+1
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