rnb2r2/1p1pkp1p/6p1/pp4NP/PP2p3/3PP1PB/1bP1PK2/2RQ3R b - - 1 21
FEN state: rnb2r2/1p1pkp1p/6p1/pp4NP/PP2p3/3PP1PB/1bP1PK2/2RQ3R b - - 1 21 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black rook at f8. Black pawn at b7, black pawn at d7, black king at e7, black pawn at f7 and black pawn at h7. Black pawn at g6. Black pawn at a5, black pawn at b5, white knight at g5 and white pawn at h5. White pawn at a4, white pawn at b4 and black pawn at e4. White pawn at d3, white pawn at e3, white pawn at g3 and white bishop at h3. Black bishop at b2, white pawn at c2, white pawn at e2 and white king at f2. White rook at c1, white queen at d1 and white rook at h1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. Black to move.