MESON Chess Problem Database

Problem Display
PID: 11045 (rn1QK3/kP1n4/P1RP1p2/5P2/8/8/8/8 w - - 0 1)

Ellison, Wallace D

Chess, 1936

rn1QK3/kP1n4/P1RP1p2/5P2/8/8/8/8

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Qb6#
    • 1...Se5
      • 2.Qb6#
    • 1...Sb6
      • 2.Qxb6#
    • 1...Sf8
      • 2.Qb6#
    • 1...Sxa6
      • 2.Qxa8#
      • 2.bxa8Q#
    • 1...Sxc6
      • 2.bxa8Q#
      • 2.bxa8R#
  • Tries
    • 1.Ke7?
      • 1...Sxa6
        • 2.Qxa8#
        • 2.bxa8Q#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sc5
        • 2.Qb6#
      • 1...Se5
        • 2.Qb6#
      • 1...Sf8
        • 2.Qb6#
      • 1...Sxc6+!
    • 1.Kf7?
      • 1...Sxa6
        • 2.Qxa8#
        • 2.bxa8Q#
      • 1...Sxc6
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sc5
        • 2.Qb6#
      • 1...Sf8
        • 2.Qb6#
      • 1...Se5+!
  • Keys
    • 1.Qc7!
      • 1...Sxa6+
        • 2.b8Q#
        • 2.b8B#
      • 1...Sxc6+
        • 2.b8S#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sc5
        • 2.Qb6#
      • 1...Se5
        • 2.Qb6#
      • 1...Sf8
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB1(F)
    • S(c);N_GUARD::QAB1(F),XS(c)
    • S(e);P_PINQ(F),XR(C)::PXR(d)=Q
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Vars
        • S(c);N_GUARD::QAB1(F),XS(c)
        • S(c);N_GUARD::QAB1(F)
      • Refutation
        • S(e);CHECK,XR(C)
    • Try
      • K(G);S_FLIGHT
      • Vars
        • S(e);XR(C)::PXR(d)=Q
        • S(c);N_GUARD::QAB1(F),XS(c)
        • S(c);N_GUARD::QAB1(F)
      • Refutation
        • S(c);CHECK
  • Actual
    • Q(F);
    • Vars
      • S(e);CHECK,OGATE,XP(B)::P=Q
      • S(e);CHECK,OGATE,XR(C)::P=S
      • S(c);N_GUARD::QAB1(F),XS(c)
      • S(c);N_GUARD::QAB1(F)
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