MESON Chess Problem Database

Problem Display
PID: 63748 (6B1/7K/5p1p/2NPpQb1/P1kqn1Rr/B3n1p1/P1bPP3/2RN4 w - - 0 1)

Moore, Robert Clyde

4th Prize, Northwest Chess, 1975

6B1/7K/5p1p/2NPpQb1/P1kqn1Rr/B3n1p1/P1bPP3/2RN4

#2

13 + 11

3771 FIDE Album (1974-1976) 1980

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Qxe4#
    • 1...Sxd2
      • 2.Qd3#
    • 1...Sf2
      • 2.Sb2#
    • 1...Sc3
      • 2.Sb2#
    • 1...Sxc5
      • 2.Sb2#
    • 1...Sd6
      • 2.Sb2#
      • 2.Qd3#
      • 2.d3#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Sa5#
      • 1...Qxd2
        • 2.Qc8#
      • 1...Qxd5
        • 2.Sb2#
        • 2.Qxe4#
        • 2.Qc8#
        • 2.d3#
      • 1...Qa1
        • 2.Qc8#
        • 2.d3#
      • 1...Qb2
        • 2.Sxb2#
        • 2.Qc8#
        • 2.d3#
      • 1...Qc3
        • 2.Qc8#
      • 1...Qc5
        • 2.Sb2#
        • 2.d3#
      • 1...Qb6
        • 2.Sb2#
        • 2.d3#
      • 1...Qd3
        • 2.Sb2#
        • 2.Qc8#
      • 1...Qa7+!
    • 1.Rxc2+?
      • 1...Qc3
        • 2.Qxe4#
      • 1...Sc3
        • 2.Sb2#
        • 2.Rxc3#
        • 2.Qd3#
        • 2.d3#
      • 1...Sxc2!
    • 1.Qxe4?
      • threat
        • 2.Sb2#
        • 2.Qd3#
        • 2.d3#
      • 1...Rxg4
        • 2.Sb2#
        • 2.d3#
      • 1...Sxd1
        • 2.Qd3#
        • 2.d6#
      • 1...Sxg4
        • 2.Sb2#
        • 2.Rxc2#
        • 2.d3#
        • 2.d6#
      • 1...Bf4
        • 2.Sb2#
        • 2.d3#
      • 1...Qxe4+!
    • 1.d6+?
      • 1...Qd5
        • 2.Qxe4#
      • 1...Sd5!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qa6#
      • 1...Sxd2+
        • 2.Sd3#
      • 1...Sf2+
        • 2.Sd3#
      • 1...Sc3+
        • 2.Sd3#
      • 1...Sxc5+
        • 2.d3#
      • 1...Sd6+
        • 2.d3#
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Qxd2
        • 2.Sb3#
      • 1...Qxd5
        • 2.Sb3#
      • 1...Qa1
        • 2.Sb3#
      • 1...Qb2
        • 2.Sb3#
      • 1...Qc3
        • 2.Sb3#
      • 1...Qd3
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(e);OGATEB,P_SPINQ(e),P_SPINS(f),XP(J)::QAR2(K),XS(f)
    • S(f);OGATE,P_PINQ(K),P_SPINQ(e),XP(D)::QAB1(K)
    • S(f);P_PINQ(K),P_SPINQ(e)::S(B)
    • S(f);N_SPINB(a),P_PINQ(K),P_SPINQ(e)::S(B)
    • S(f);P_PINQ(K),P_SPINQ(e),XS(I)::S(B)
  • Tries
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • Q(e);N_GUARD,P_SPINS(f),XP(D)::QAR(K)
        • Q(e);N_GUARD,N_SPINB(a),P_SPINS(f)::QAR(K)
      • Refutation
        • Q(e);CHECK,P_SPINS(f)
    • Try
      • R(A);CHECK,XB(a)
      • Vars
        • Q(e);P_SPINQ(e),P_SPINS(f),S_CUTS(b)::QAR2(K),XS(f)
      • Refutation
        • S(b);XR(A)
    • Try
      • Q(K);P_PINQ(e),P_SPINQ(K),XS(f)
      • Threat
        • DUALS(3)
      • Refutation
        • Q(e);CHECK,XQ(K)
    • Try
      • P(J);CHECK
      • Vars
        • Q(e);P_SPINQ(e),P_SPINS(f),S_CUTS(b)::QAR2(K),XS(f)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • Q(K);
    • Threat
      • QAB(K)
    • Vars
      • S(f);CHECK,N_GUARD,P_SPINQ(e),XP(D)::QAR(K)+S(I)
      • S(f);CHECK,N_GUARD,P_SPINQ(e)::QAR(K)+S(I)
      • S(f);CHECK,N_GUARD,N_SPINB(a),P_SPINQ(e)::QAR(K)+S(I)
      • S(f);CHECK,P_SPINQ(e),P_SPINS(f),XS(I)::P(D)
      • S(f);CHECK,P_SPINQ(e)::P(D)
      • Q(e);OGATE,P_SPINQ(e),P_SPINS(f),XS(I)::QAR1(K),XQ(e)
      • Q(e);N_GUARD,P_SPINS(f),XP(D)::QAR(K)+S(I)
      • Q(e);N_GUARD,P_SPINQ(e),P_SPINS(f),XP(J)::QAR(K)+S(I)
      • Q(e);N_GUARD,P_SPINS(f)::QAR(K)+S(I)
      • Q(e);N_GUARD,N_SPINB(a),P_SPINS(f)::QAR(K)+S(I)
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