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How can white mte black in 4 moves in this game. This might be easy but I am a beginner.
The king has no escape squares and, as is often the case in these puzzles, every move must be a check.
[FEN "r1br4/1p3qp1/p1kb3p/2NN1p2/1PPQ4/8/P5PP/R4RK1 w - - 0 1"]
1. b5+ axb5 2. cxb5+ Kxb5 3. Rfb1+ Kc6 4. Rb6#
Required, but never shown