r1bk1r2/p4p1p/n1pbB3/1p1n4/2NR2P1/N2P4/PPPKPP2/1R1Q4 b - - 4 23
FEN state: r1bk1r2/p4p1p/n1pbB3/1p1n4/2NR2P1/N2P4/PPPKPP2/1R1Q4 b - - 4 23 ; Best move: d6b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8 and black rook at f8. Black pawn at a7, black pawn at f7 and black pawn at h7. Black knight at a6, black pawn at c6, black bishop at d6 and white bishop at e6. Black pawn at b5 and black knight at d5. White knight at c4, white rook at d4 and white pawn at g4. White knight at a3 and white pawn at d3. White pawn at a2, white pawn at b2, white pawn at c2, white king at d2, white pawn at e2 and white pawn at f2. White rook at b1 and white queen at d1. Both players have exhausted their castles. Half move number is 4. Full move number is 23. Black to move.