MESON Chess Problem Database

Problem Display
PID: 133914 (4qBBn/2p1rNnp/2PPk2r/1p1Np2p/4P3/4Q2K/8/8 w - - 0 1)

Eddy, Edwin John

The Field, 1962

(First published on Thu Oct 4 1962)

4qBBn/2p1rNnp/2PPk2r/1p1Np2p/4P3/4Q2K/8/8

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.Sg5#
      • 2.Sd8#
    • 1...Sxf7
      • 2.Qxh6#
    • 1...cxd6
      • 2.Sg5#
      • 2.Sd8#
  • Tries
    • 1.Sxc7+?
      • 1...Kf6
        • 2.Qg5#
      • 1...Rxc7!
    • 1.Sxh8+?
      • 1...Qf7
        • 2.Qxh6#
      • 1...Rf7
        • 2.Qxh6#
      • 1...Kxd6!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qxe5#
      • 1...Qxc6
        • 2.Qxe7#
      • 1...Qxf7
        • 2.Qxe7#
      • 1...Rxf7
        • 2.Sxc7#
      • 1...Sxf7
        • 2.Qxh6#
      • 1...cxd6
        • 2.Sd8#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg6
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(k);N_GUARD,P_SPINS(k),XS(G)::QAR(A),XR(e)
  • Tries
    • Try
      • S(D);CHECK,XP(f)
      • Vars
        • K(d);P-FLIGHT::QAB1(A)
      • Refutation
        • R(g);XS(D)
    • Try
      • S(G);CHECK,XS(k)
      • Vars
        • Q(j);P_SPINQ(j)::QAR(A),XR(e)
        • R(g);P_SPINR(g)::QAR(A),XR(e)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(g),XP(F)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XP(b)
    • Vars
      • Q(j);N_GUARD,XP(E)::QAR1(A),XR(g)
      • Q(j);N_GUARD,P_SPINQ(j),XS(G)::QAR1(A),XR(g)
      • R(g);N_GUARD,P_SPINR(g),XS(G)::S(D),XP(f)
      • S(k);N_GUARD,P_SPINS(k),XS(G)::QAR(A),XR(e)
      • P(f);SBLOCK,XP(F)::B(I)+S(G),DCHECK
      • S(h);N_GUARD::QAB1(A),XS(h)
      • S(k);S_CUTR(e)::QAR1(A)
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