4k2r/r2qppb1/1p5p/pQ1p2p1/PpP3PP/4N2R/3P1P2/RBB2KNb w k - 0 21
FEN state: 4k2r/r2qppb1/1p5p/pQ1p2p1/PpP3PP/4N2R/3P1P2/RBB2KNb w k - 0 21 ; Best move: d2d4
The current state of the chess board is: Black king at e8 and black rook at h8. Black rook at a7, black queen at d7, black pawn at e7, black pawn at f7 and black bishop at g7. Black pawn at b6 and black pawn at h6. Black pawn at a5, white queen at b5, black pawn at d5 and black pawn at g5. White pawn at a4, black pawn at b4, white pawn at c4, white pawn at g4 and white pawn at h4. White knight at e3 and white rook at h3. White pawn at d2 and white pawn at f2. White rook at a1, white bishop at b1, white bishop at c1, white king at f1, white knight at g1 and black bishop at h1. Black kingside is the only castle move available. Half move number is 0. Full move number is 21. White to move.