r1b1k3/1p1p3r/2p1p1p1/pN1n3p/P1P1P1pP/1P2b1K1/R2P3R/2BQ1B1N w q - 1 21
FEN state: r1b1k3/1p1p3r/2p1p1p1/pN1n3p/P1P1P1pP/1P2b1K1/R2P3R/2BQ1B1N w q - 1 21 ; Best move: d2e3
The current state of the chess board is: Black rook at a8, black bishop at c8 and black king at e8. Black pawn at b7, black pawn at d7 and black rook at h7. Black pawn at c6, black pawn at e6 and black pawn at g6. Black pawn at a5, white knight at b5, black knight at d5 and black pawn at h5. White pawn at a4, white pawn at c4, white pawn at e4, black pawn at g4 and white pawn at h4. White pawn at b3, black bishop at e3 and white king at g3. White rook at a2, white pawn at d2 and white rook at h2. White bishop at c1, white queen at d1, white bishop at f1 and white knight at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.