Solution to Retrograde Problem

Black to move

1... Bxd5+

This only draws, but that is not the task. After  1... Rxd5 2.Kxb4 Rd4+ 3.c4+ Kd2 4.Ka5 Bxc4 white has a B vs. R and B and will lose in 15 moves at most.

2. c4 bxc3+ 

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