Originally posted by ilywrin
Does White need to recapture on d5?
Why not try 2.a5!? bxa5 3.b5 axb5 4.cxb5 Ke7 5.b6 Kd7 6.g5, etc
I am not sure this works though
Firstly, White can win only by forcing a passed pawn on each wing and queening one before Black.
After 1. d5 cxd5 White should play 2. exd5 (rather than cxd5) in order to keep 3 connected pawns on the queenside.
A typical winning line might be
1. d5 cxd5
2. exd5 exd5
3. a5 bxa5
4. b5 axb5
5. cxb5 Ke7
6. b6 Kd7
7. b7 Kc7
8. b8Q+ Kxb8.
9. g5 fxg5
10. h5 gxh5
11. f5 winning.
But if Black doesn't obligingly play 2.. exd5, what can White do about the pawn on e6 - which helps to prevent White from forcing a passed pawn on the King side.
Trying your suggestion:
1. d5 cxd5
2. a5 bxa5
3. b5 axb5
4. cxb5 Ke7 (because Black will lose the pawn race)
5. b6 and yes, it does seem to win!
(By P. Cathignol, 1981)
I remember reading that the position below is also winning for White (not sure if the Kings are on bishop's file or queen's).
But one would probably need a program like Freezer to prove it.