1nb1kb1r/rq1ppp2/2p5/p1N1P1p1/PpPP1P1p/6nP/RP4P1/4KBN1 b - - 2 21
FEN state: 1nb1kb1r/rq1ppp2/2p5/p1N1P1p1/PpPP1P1p/6nP/RP4P1/4KBN1 b - - 2 21 ; Best move: b4b3
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black rook at a7, black queen at b7, black pawn at d7, black pawn at e7 and black pawn at f7. Black pawn at c6. Black pawn at a5, white knight at c5, white pawn at e5 and black pawn at g5. White pawn at a4, black pawn at b4, white pawn at c4, white pawn at d4, white pawn at f4 and black pawn at h4. Black knight at g3 and white pawn at h3. White rook at a2, white pawn at b2 and white pawn at g2. White king at e1, white bishop at f1 and white knight at g1. Both players have exhausted their castles. Half move number is 2. Full move number is 21. Black to move.