Answers for checking the King:
Level Beginner (a)1. Ra8# (Rook moves up to a8 checkmate) 2. Bb5+ (Bishop moves up to square b5)
3. Qd8# (Queen moves up to d8 checkmate) 4. Qh5# (Queen moves up to h5 checkmate)
5. Qxf7# (Queen captures pawn f7 checkmate) 6. a8# (Pawn moves up to a8 checkmate)
Level Beginner (b)
1. Rh1+ (Rook moves to square h1 check) 2. Qg4+ (Queen moves up to g4 check)
3. Bc2 or f7+ (Bishop moves to c2 or f7 check) 4. Qc4+ (Queen moves up to c4 check)
5. Nf7+ (Knight moves up to square f7 check) 6. Rxg7+ (Rook captures pawn g7 check)
7. Qf7+ (Queen moves up to square f7 check)
Level Beginner (c)
1. Re7+ (Rook moves up to square e7 check) 2. exf6+ (Pawn captures pawn f6 check)
3. Qxh7+ (Queen captures pawn h7 check) 4. g4+ (Pawn moves up to g4 check)
5. Qxh8+ (Queen captures rook h8 check) 6. Ne7+ (Knight moves up to e7 check)
7. Rxf8+ (Rook captures rook on square f8 check)
Level Intermediate (a) (Black to play)
1. Bxg2+ (Bishop captures pawn g2 check) 2. Rg4+ (Rook moves down to g4 check)
3. Rxd1+ (Rook captures rook d1 check) 4. Be3+ (Bishop moves down to e3 check)
5. Qb6+ (Queen moves to square b6) 6. Nh3# (Knight moves down h3 checkmate)
Level Intermediate (b) (Black to play)
1. Qxg5+ (Queen captures pawn g5 check) 2. Ne2+ (Knight moves to square e2 check)
3. Qh2+ (Queen moves down to h2 check) 4. Rf1# (Rook moves down to f1 checkmate)
5. Rxg2+ (Rook captures pawn g2 check) 6. Bd4+ (Bishop moves down to d4 check)
7. Rg2+ (Rook moves to square g2 check) 8. Nd3+ (Knight moves down to d3 check)
Level Advanced (a) (Black to play)
1. Qb7+ (Queen moves up to b7 check) 2. e5+ (Pawn moves down to e5 check)
3. Qxh4+ (Queen captures pawn h4 check) 4. e4+ (Pawn moves down to e4 check)
5. Ne8 or h5+ (Knight moves to e8 or h5 check) 6. fxg4+ (Pawn captures pawn g5 check)
7. fxe2+ (Pawn captures knight e2 check) 8. Rd3+ (Rook moves down d3 check)
Level Advanced (b) (Black to play)
1. Qxd3+ (Queen captures bishop d3 check) 2. Qh7+ (Queen moves to h7 check)
3. Nf3+ (Knight moves down to f3 check) 4. e4+ (Pawn moves down to e4 check)
5. b1+ (Pawn moves down to b1 check) 6. Bf1+ (Bishop moves down to f1 check)
7. e5+ (Pawn moves down to e5 check) 8. Re1+ (Rook moves down to e1 check)
