1rb2k1r/3p2p1/p1p2N1p/4ppN1/P1Pn2n1/Rq1P4/4PP1P/2b1KB1R b - - 1 21
FEN state: 1rb2k1r/3p2p1/p1p2N1p/4ppN1/P1Pn2n1/Rq1P4/4PP1P/2b1KB1R b - - 1 21 ; Best move: b3b4
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at f8 and black rook at h8. Black pawn at d7 and black pawn at g7. Black pawn at a6, black pawn at c6, white knight at f6 and black pawn at h6. Black pawn at e5, black pawn at f5 and white knight at g5. White pawn at a4, white pawn at c4, black knight at d4 and black knight at g4. White rook at a3, black queen at b3 and white pawn at d3. White pawn at e2, white pawn at f2 and white pawn at h2. Black bishop at c1, white king at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. Black to move.