Visualization Puzzles #4
Easy:After 1. Rh7+ Kg8 2. Rfg7+ Kf8 3. Rxd7, can Black get away with ...a1=Q?
Medium:The game went 50...Rf8 51. Rxb4 f6 52. Bc5 Rc8 53. exf6 Rxc5 54. f7 Rc8 55. Rb7 and now Black played ...Bd3, but what if Black had played ...Bg6 intending ...Rf8 and ...Rxf7?
Difficult (gonna need some deep concentration for this one):40...g4+ 41. Kg2 Kf7 42. Nxa6 Re1 43. h4 (43. h3 loses more quickly to 43...Rg1+ 44. Kh2 f4) Kg6
44. Nb4 f4 45. gxf4 Rg1+ 46. Kh2 g3+ 47. Kh3 Bf2 (as much as White would love to kill Black's play with an exchange sac, there is never a good chance to do so in this game)
48. Kg4 Rh1 49. f5+ Kf6 50. Nd5+ Ke5 51. Kf3 (necessary in order to stop ...g2) Kxf5
52. Nxc7 Rxh4 53. Nxb5 Rf4+ 54. Kg2 h5
Here White played 55. Rd8, which didn't work out. Instead, bringing the knight on b5 back into play is something that White would love to do, for example 55. Nd4+ Kg4 56. Ne2 Re4 57. Ng1 and the knight is very much participating in the blockade. You may think about how to break the blockade, or if you just want to test your visualization/endgame knowledge, you can look at the next paragraph.
Basically, the key is to take the knight. You can take the knight when it reaches g1, but here's the question: if White plays 55. Nd4+, does 55...Bxd4 56. Rxd4 Rxd4 win for Black?