MESON Chess Problem Database

Problem Display
PID: 16866 (4Q3/2q1B1K1/8/1B3R2/3R2N1/2P3Nb/8/4k3 w - - 0 1)

Sheppard, Charles William

1st Prize, American Chess Bulletin, 1944

4Q3/2q1B1K1/8/1B3R2/3R2N1/2P3Nb/8/4k3

#2

9 + 3

5088 How to Solve Chess Problems 1945
5064 100 Years of the American Two-move Chess Problem 1962
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg3
      • 2.Bh4#
    • 1...Qa5
      • 2.Ba3#
      • 2.Bb4#
      • 2.Bh4#
      • 2.Bc5#
      • 2.Bg5#
      • 2.Bd6#
      • 2.Bf6#
      • 2.Bd8#
      • 2.Bf8#
      • 2.Re5#
    • 1...Qe5+
      • 2.Rxe5#
    • 1...Qb6
      • 2.Bd6#
      • 2.Re5#
    • 1...Qd6
      • 2.Bxd6#
    • 1...Qd8
      • 2.Bxd8#
      • 2.Re5#
    • 1...Qxc3
      • 2.Bb4#
    • 1...Qc5
      • 2.Bxc5#
    • 1...Qa7
      • 2.Re5#
    • 1...Qd7
      • 2.Re5#
    • 1...Qxe7+
      • 2.Qxe7#
    • 1...Qc8
      • 2.Re5#
    • 1...Bf1
      • 2.Rxf1#
    • 1...Bxg4
      • 2.Rf1#
  • Tries
    • 1.Rfd5?
      • threat
        • 2.Rd1#
        • 2.Re4#
      • 1...Qe5+
        • 2.Rxe5#
      • 1...Qxe7+
        • 2.Qxe7#
      • 1...Qxg3
        • 2.Bh4#
        • 2.Rd1#
      • 1...Qxc3
        • 2.Bb4#
      • 1...Qf4
        • 2.Rd1#
      • 1...Qb6
        • 2.Bd6#
        • 2.Rd1#
        • 2.Re5#
      • 1...Qc4
        • 2.Rd1#
      • 1...Qc5
        • 2.Bxc5#
        • 2.Bd6#
        • 2.Rd1#
      • 1...Qa7
        • 2.Rd1#
        • 2.Re5#
      • 1...Bf1
        • 2.Rd1#
      • 1...Bg2
        • 2.Rd1#
      • 1...Bxg4!
  • Keys
    • 1.Ba4!
      • threat
        • 2.Rd1#
      • 1...Qe5+
        • 2.Rxe5#
      • 1...Qxe7+
        • 2.Qxe7#
      • 1...Qxg3
        • 2.Bh4#
      • 1...Qxc3
        • 2.Bb4#
      • 1...Bxg4
        • 2.Rf1#
      • 1...Qd6
        • 2.Bxd6#
      • 1...Qd8
        • 2.Bxd8#
        • 2.Re5#
      • 1...Qd7
        • 2.Re5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_PINB(G),P_PINS(D),XS(B)::QAR(I)+B(G)
    • Q(c);CHECK,N_GUARD,N_PINB(G)::R(F),XQ(c)
    • Q(c);N_PINB(G)::QAR(I)+B(G),XQ(c)
    • Q(c);N_PINB(G),P_PINR(C),XP(A)::QAR(I)+B(G)
    • Q(c);N_GUARD::R(F)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XB(G)::QAR(I),XQ(c)
    • Q(c);N_GUARD,N_PINB(G)::R(F)
    • B(b);N_GUARD::R1(F),XB(b)
    • B(b);N_GUARD,XS(D)::R1(F)
  • Tries
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,N_GUARD,N_PINB(G)::R(F),XQ(c)
        • Q(c);CHECK,OGATE,P_SPINQ(c),XB(G)::QAR(I),XQ(c)
        • Q(c);N_PINB(G),P_PINR(C),XP(A)::QAR(I)+B(G)
        • Q(c);N_PINB(G)::R1(C)
        • B(b);::R1(C)
      • Refutation
        • B(b);XS(D)
  • Actual
    • B(E);
    • Threat
      • R1(C)
    • Vars
      • Q(c);CHECK,N_GUARD,N_PINB(G)::R(F),XQ(c)
      • Q(c);CHECK,OGATE,P_SPINQ(c),XB(G)::QAR(I),XQ(c)
      • Q(c);N_PINB(G),P_PINS(D),XS(B)::QAR(I)+B(G)
      • Q(c);N_PINB(G),P_PINR(C),XP(A)::QAR(I)+B(G)
      • B(b);N_GUARD,XS(D)::R1(F)
      • Q(c);N_PINB(G)::QAR(I)+B(G),XQ(c)
      • Q(c);N_GUARD::R(F)
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