bn1k1b1r/r2ppppp/p6n/1p6/1Q1Pq1PP/N3P2B/PpP1KP2/R1B3N1 w - - 4 21
FEN state: bn1k1b1r/r2ppppp/p6n/1p6/1Q1Pq1PP/N3P2B/PpP1KP2/R1B3N1 w - - 4 21 ; Best move: b4b2
The current state of the chess board is: Black bishop at a8, black knight at b8, black king at d8, black bishop at f8 and black rook at h8. Black rook at a7, black pawn at d7, black pawn at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black pawn at a6 and black knight at h6. Black pawn at b5. White queen at b4, white pawn at d4, black queen at e4, white pawn at g4 and white pawn at h4. White knight at a3, white pawn at e3 and white bishop at h3. White pawn at a2, black pawn at b2, white pawn at c2, white king at e2 and white pawn at f2. White rook at a1, white bishop at c1 and white knight at g1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. White to move.