1nb1qk1r/pr1ppNbp/Qpp5/2P2p1P/1P1Pn1p1/N4P2/PB2P1P1/R2K1B1R w - - 3 21
FEN state: 1nb1qk1r/pr1ppNbp/Qpp5/2P2p1P/1P1Pn1p1/N4P2/PB2P1P1/R2K1B1R w - - 3 21 ; Best move: a6a4
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at e8, black king at f8 and black rook at h8. Black pawn at a7, black rook at b7, black pawn at d7, black pawn at e7, white knight at f7, black bishop at g7 and black pawn at h7. White queen at a6, black pawn at b6 and black pawn at c6. White pawn at c5, black pawn at f5 and white pawn at h5. White pawn at b4, white pawn at d4, black knight at e4 and black pawn at g4. White knight at a3 and white pawn at f3. White pawn at a2, white bishop at b2, white pawn at e2 and white pawn at g2. White rook at a1, white king at d1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 3. Full move number is 21. White to move.