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Czentovic
25-01-2013, 10:06 AM
wKa1,Ra2,Rb1 or 8/8/8/8/8/8/R7/KR6 w

White wins by checkmating Black, Black wins by playing 50 moves or if White makes an illegal move. With best play, who wins? How many moves?

Mr. Pawn
25-01-2013, 03:14 PM
wKa1,Ra2,Rb1 or 8/8/8/8/8/8/R7/KR6 w

White wins by checkmating Black, Black wins by playing 50 moves or if White makes an illegal move. With best play, who wins? How many moves?

A possible solution:

1.Rbb2
2.Ra3
3.Kb1
4.Kc2
5.Rc3
6.Rb1
7.Rd1
8.Rd2
9.Kd1
10.Ke2
11.Re3
12.Rd1
13.Rf1
14.Rf2
15.Kf1
16.Kg2
17.Rg3
18.Rf1
19.Rh1#

It's not pretty or efficient, but I think it works

Czentovic
25-01-2013, 04:56 PM
Not quite what I had in mind, but it is completely correct and fun to watch - well done!

Kevin Bonham
25-01-2013, 07:31 PM
Am I missing something here? Where is the black king? Or is it invisible?

Desmond
25-01-2013, 07:37 PM
Am I missing something here? Where is the black king? Or is it invisible?I think it's taken that the black king may be on any square and the technique should still work.

Czentovic
25-01-2013, 07:47 PM
Yes, the Black King is on any square which is not prohibited by the previous play. Also, I forgot to mention that Black wins if White stalemates. (But Mr. Pawn obviously realised that)