rn1k1bnr/6pp/p3P3/1ppp4/5p2/1N2Qb1P/PPP1PPP1/R3KBR1 w Q - 0 21
FEN state: rn1k1bnr/6pp/p3P3/1ppp4/5p2/1N2Qb1P/PPP1PPP1/R3KBR1 w Q - 0 21 ; Best move: e3f4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at d8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at g7 and black pawn at h7. Black pawn at a6 and white pawn at e6. Black pawn at b5, black pawn at c5 and black pawn at d5. Black pawn at f4. White knight at b3, white queen at e3, black bishop at f3 and white pawn at h3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at e2, white pawn at f2 and white pawn at g2. White rook at a1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.