I have never posted anything in this forum before, but I am a little confused about this puzzle: lichess.org/training/XpUvu
After looking at the position for nearly 10 minutes, I found a variation which continued with 44. ... bxa5 45. kxc5 kxf4 46. d4 a4 47. d5 a3 48. d6 a2 49. d7 a1=Q 50. d8=Q after which black can give a few checks and eventually win the g pawn as well. Seeing this, I mentally decided that by being two pawns up in a barren queen v. queen endgame, black has to be winning. But of course, that was not the best solution, and I got the puzzle wrong, since 45. ... a4 first before 46. ... kxf4 is better.
However, when I ran my own line through the engine, the engine said that although not as good, 45. ... kxf4 is winning as well [-1.9]. White's queen will give a bunch of checks, but if both players play perfectly, one of black's extra two pawns will eventually queen and white will lose.
I have never seen the engine make a mistake, and so if a puzzle can only have one winning solution, what the heck is going on over here? Does anybody know?
After looking at the position for nearly 10 minutes, I found a variation which continued with 44. ... bxa5 45. kxc5 kxf4 46. d4 a4 47. d5 a3 48. d6 a2 49. d7 a1=Q 50. d8=Q after which black can give a few checks and eventually win the g pawn as well. Seeing this, I mentally decided that by being two pawns up in a barren queen v. queen endgame, black has to be winning. But of course, that was not the best solution, and I got the puzzle wrong, since 45. ... a4 first before 46. ... kxf4 is better.
However, when I ran my own line through the engine, the engine said that although not as good, 45. ... kxf4 is winning as well [-1.9]. White's queen will give a bunch of checks, but if both players play perfectly, one of black's extra two pawns will eventually queen and white will lose.
I have never seen the engine make a mistake, and so if a puzzle can only have one winning solution, what the heck is going on over here? Does anybody know?