MESON Chess Problem Database

Problem Display
PID: 12099 (8/4p3/p1BQ3B/p1p2p2/Pk1r1q1R/N7/KP1P4/1R6 w - - 0 1)

Quack, Godfrey C

The Problemist, 1974

8/4p3/p1BQ3B/p1p2p2/Pk1r1q1R/N7/KP1P4/1R6

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2
      • 2.Bxd2#
      • 2.Qb8#
    • 1...Qh2
      • 2.Rxd4#
    • 1...Qe3
      • 2.Qb8#
    • 1...Qg3
      • 2.Rxd4#
    • 1...Qg5
      • 2.Rxd4#
      • 2.Qb8#
    • 1...Qxh6
      • 2.Rxd4#
      • 2.Qb8#
    • 1...Qf2
      • 2.Qb8#
    • 1...Qf3
      • 2.Rxd4#
      • 2.Qb8#
    • 1...Qe4
      • 2.Qb8#
    • 1...Qg4
      • 2.Qb8#
    • 1...Qxh4
      • 2.Qb8#
    • 1...Rxd2
      • 2.Qb8#
      • 2.Qxd2#
    • 1...Rd3
      • 2.Qb8#
    • 1...Rd5
      • 2.Qb8#
    • 1...e5
      • 2.Qb8#
  • Tries
    • 1.Rxf4?
      • threat
        • 2.Rxd4#
        • 2.Qb8#
      • 1...Rxf4
        • 2.Qb8#
      • 1...Rc4
        • 2.Sc2#
        • 2.Rxc4#
        • 2.Qb8#
      • 1...Re4
        • 2.Qb8#
      • 1...e5
        • 2.Qb8#
      • 1...exd6!
    • 1.d3?
      • threat
        • 2.Sc2#
      • 1...Rxd3
        • 2.Qb8#
      • 1...Qc1
        • 2.Qb8#
      • 1...Qd2
        • 2.Bxd2#
        • 2.Rxd4#
        • 2.Qb8#
      • 1...Qh2
        • 2.Rxd4#
      • 1...Qf2
        • 2.Qb8#
      • 1...Rc4!
  • Keys
    • 1.b3!
      • threat
        • 2.Sc2#
      • 1...Qxd2+
        • 2.Bxd2#
      • 1...Rxd2+
        • 2.Qxd2#
      • 1...Qe4
        • 2.Qb8#
      • 1...Rc4
        • 2.bxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(c);OGATE,P_SPINR(b)::R(G),XR(b)
    • Q(c);N_GUARD,P_SPINR(b)::QAR(I)
    • Q(c);N_GUARD::QAR(I)
    • Q(c);N_GUARD,XR(G)::QAR(I)
    • R(b);P_SPINQ(c)::QAR(I)
    • P(h);S_CUTQ(c)::QAR(I)
  • Tries
    • Try
      • R(G);P_PINR(b),XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_SPINR(b),XR(G)::QAR(I)
        • R(b);::QAR(I)
        • P(h);::QAR(I)
      • Refutation
        • P(h);N_SPINP(e),XQ(I)
    • Try
      • P(D);
      • Threat
        • S(E)
      • Vars
        • R(b);P_SPINQ(c),XP(D)::QAR(I)
        • Q(c);N_GUARD,P_SPINR(b)::QAR(I)
        • Q(c);OGATE,P_PINP(C),P_SPINR(b)::R(G),XR(b)
        • Q(c);N_GUARD,P_PINP(C),P_SPINR(b)::QAR(I)
      • Refutation
        • R(b);
  • Actual
    • P(C);
    • Threat
      • S(E)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINR(b),XP(D)::B(J),XQ(c)
      • R(b);CHECK,OGATE,P_SPINQ(c),XP(D)::QAB(I),XR(b)
      • Q(c);N_GUARD::QAR(I)
      • R(b);OGATE::R(A)+P(C),XR(b)
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