MESON Chess Problem Database

Problem Display
PID: 1130 (5r2/1Bq3Qp/2Pr4/p5Np/3B1P2/4R2N/1R2P1kp/4K2b w - - 0 1)

McWilliam, Robert C

Problem Observer, 1973

5r2/1Bq3Qp/2Pr4/p5Np/3B1P2/4R2N/1R2P1kp/4K2b

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Se6#
    • 1...Qb8
      • 2.Se6#
    • 1...Qxc6
      • 2.Se6#
    • 1...Qc8
      • 2.Se6#
    • 1...Rxd4
      • 2.Sf7#
    • 1...Rxc6
      • 2.Sf7#
    • 1...Rd7
      • 2.Sf7#
    • 1...Rdd8
      • 2.Sf7#
  • Tries
    • 1.Sf3+?
      • 1...Qxg7
        • 2.Sh4#
      • 1...Rg6
        • 2.Sh4#
      • 1...Kxh3!
    • 1.Sxh7+?
      • 1...Rg6
        • 2.Qxg6#
      • 1...Qxg7!
    • 1.Ra3?
      • threat
        • 2.e4#
      • 1...Qxc6
        • 2.Se6#
      • 1...Rxd4
        • 2.Sf7#
      • 1...Rxc6
        • 2.Sf7#
      • 1...Rxf4
        • 2.Sxf4#
      • 1...Qb6
        • 2.Se6#
      • 1...Qxb7!
    • 1.Rc3?
      • threat
        • 2.e4#
      • 1...Rxd4
        • 2.Sf7#
      • 1...Rxf4
        • 2.Sxf4#
      • 1...Qb6
        • 2.Se6#
      • 1...Qxb7!
    • 1.Rd3?
      • threat
        • 2.e4#
      • 1...Qxc6
        • 2.Se6#
      • 1...Rxc6
        • 2.Sf7#
      • 1...Rxf4
        • 2.Sxf4#
      • 1...Qb6
        • 2.Se6#
      • 1...Qxb7!
  • Keys
    • 1.Reb3!
      • threat
        • 2.e4#
      • 1...Qxc6
        • 2.Se6#
      • 1...Rxd4
        • 2.Sf7#
      • 1...Rxc6
        • 2.Sf7#
      • 1...Rxf4
        • 2.Sxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD::QAR(K)+S(H)
    • Q(g);N_GUARD,P_SPINQ(g),XP(I)::QAR(K)+S(H)
    • R(f);N_GUARD,XB(F)::QAR(K)+S(H)
    • R(f);N_GUARD,P_SPINR(f),XP(I)::QAR(K)+S(H)
    • R(f);N_GUARD::QAR(K)+S(H)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • Q(g);XQ(K)::S(H)
        • R(f);P_SPINR(f)::S(H)
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • S(H);CHECK,XP(h)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAR(K),XR(f)
      • Refutation
        • Q(g);XQ(K)
    • Try
      • R(D);
      • Threat
        • R(B)+P(C)
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g),XP(I)::QAR(K)+S(H)
        • R(f);N_GUARD,XB(F)::QAR(K)+S(H)
        • R(f);N_GUARD,P_SPINR(f),XP(I)::QAR(K)+S(H)
        • R(i);XP(G)::S(E),XR(i)
        • Q(g);N_GUARD::QAR(K)+S(H)
      • Refutation
        • Q(g);XB(J)
    • Try
      • R(D);
      • Threat
        • R(B)+P(C)
      • Vars
        • R(f);N_GUARD,XB(F)::QAR(K)+S(H)
        • R(i);XP(G)::S(E),XR(i)
        • Q(g);N_GUARD::QAR(K)+S(H)
      • Refutation
        • Q(g);XB(J)
    • Try
      • R(D);
      • Threat
        • R(B)+P(C)
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g),XP(I)::QAR(K)+S(H)
        • R(f);N_GUARD,P_SPINR(f),XP(I)::QAR(K)+S(H)
        • R(i);XP(G)::S(E),XR(i)
        • Q(g);N_GUARD::QAR(K)+S(H)
      • Refutation
        • Q(g);XB(J)
  • Actual
    • R(D);
    • Threat
      • R(B)+P(C)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XP(I)::QAR(K)+S(H)
      • R(f);N_GUARD,XB(F)::QAR(K)+S(H)
      • R(f);N_GUARD,P_SPINR(f),XP(I)::QAR(K)+S(H)
      • R(i);XP(G)::S(E),XR(i)
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