MESON Chess Problem Database

Problem Display
PID: 67846 (2b3K1/4Qpp1/1Nk3r1/Pp1R2r1/1pqP4/8/2R5/8 w - - 0 1)

Gunn, Robert Ivan

3rd Prize, Chess, 1948

2b3K1/4Qpp1/1Nk3r1/Pp1R2r1/1pqP4/8/2R5/8

#2

7 + 9

81 Chess 1950

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rcxc5#
    • 1...Rd6
      • 2.Rxd6#
    • 1...Ba6
      • 2.Qd7#
    • 1...Be6
      • 2.Rd6#
    • 1...Bb7
      • 2.Qd7#
    • 1...Bd7
      • 2.Qxd7#
  • Tries
    • 1.Sxc8?
      • threat
        • 2.Qd7#
      • 1...Rxd5
        • 2.Sa7#
      • 1...Rd6
        • 2.Rxd6#
      • 1...Kxd5!
    • 1.Qe8+?
      • 1...Kc7
        • 2.Qxc8#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Kb7!
  • Keys
    • 1.Rd7!
      • threat
        • 2.Rc7#
      • 1...f5+
        • 2.d5#
      • 1...f6+
        • 2.Qe6#
      • 1...Bxd7
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(b);OGATE::R1(A),XQ(b)
    • R(f);N_GUARD::R1(D),XR(f)
    • B(i);N_GUARD::QAB1(F)
    • B(i);S_CUTR(f)::R1(D)
    • B(i);N_GUARD::QAB1(F),XB(i)
  • Tries
    • Try
      • S(E);XB(i)
      • Threat
        • QAB1(F)
      • Vars
        • R(d);SBLOCK,XR(D)::S(E)
        • R(f);N_GUARD::R1(D),XR(f)
      • Refutation
        • K(e);N_SPINQ(b),S_FLIGHT,XR(D)
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);P-FLIGHT::QAR1(F),XB(i)
        • B(i);N_GUARD,P_SPINB(i)::QAB1(F),XB(i)
      • Refutation
        • K(e);N_SPINQ(b),S_FLIGHT
  • Actual
    • R(D);
    • Threat
      • R1(D)
    • Vars
      • P(g);CHECK,S_CUTR(d)::P(B)
      • P(g);CHECK,N_GUARD,S_CUTR(f)::QAR2(F)
      • B(i);OGATE,XR(D)::QAB1(F),XB(i)
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