r1bk2n1/1p1nb3/p5pr/2ppPpQp/1NP5/5PPN/PP2P2P/R3KB1R b KQ - 4 21
FEN state: r1bk2n1/1p1nb3/p5pr/2ppPpQp/1NP5/5PPN/PP2P2P/R3KB1R b KQ - 4 21 ; Best move: e7g5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8 and black knight at g8. Black pawn at b7, black knight at d7 and black bishop at e7. Black pawn at a6, black pawn at g6 and black rook at h6. Black pawn at c5, black pawn at d5, white pawn at e5, black pawn at f5, white queen at g5 and black pawn at h5. White knight at b4 and white pawn at c4. White pawn at f3, white pawn at g3 and white knight at h3. White pawn at a2, white pawn at b2, white pawn at e2 and white pawn at h2. White rook at a1, white king at e1, white bishop at f1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 4. Full move number is 21. Black to move.