Just for fun. I tested some engines with this position (original) which requires a Bishop promotion to win:
[d]4r3/5P1k/5K2/5N2/8/8/8/8 w - - 0 1
Actually Rybka 2.2 (the only version I have) fails to solve it and draws, while all other engines I tried (but mine ) get it. Of course, with 5-man TB's there is no issue.