MESON Chess Problem Database

Problem Display
PID: 18269 (RqB5/NPPn4/k7/1R3K2/8/8/8/8 w - - 0 1)

Allison, Christopher John

Time & Tide, 1954

RqB5/NPPn4/k7/1R3K2/8/8/8/8

#2

7 + 3

15148 Sadier Collection 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa7
      • 2.b8Q#
      • 2.b8R#
    • 1...Qxc7
      • 2.b8S#
    • 1...Qxb7
      • 2.Bxb7#
    • 1...Qxa8
      • 2.bxa8Q#
      • 2.bxa8R#
    • 1...Qxc8
      • 2.bxc8Q#
      • 2.bxc8B#
    • 1...Sc5
      • 2.cxb8S#
    • 1...Se5
      • 2.cxb8S#
    • 1...Sb6
      • 2.cxb8S#
    • 1...Sf6
      • 2.cxb8S#
    • 1...Sf8
      • 2.cxb8S#
  • Tries
    • 1.Kf4?
      • 1...Qxa7
        • 2.b8Q#
        • 2.b8R#
      • 1...Qxb7
        • 2.Bxb7#
      • 1...Qxa8
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Qxc8
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...Sc5
        • 2.cxb8S#
      • 1...Se5
        • 2.cxb8S#
      • 1...Sb6
        • 2.cxb8S#
      • 1...Sf6
        • 2.cxb8S#
      • 1...Sf8
        • 2.cxb8S#
      • 1...Qxc7+!
  • Keys
    • 1.Kg5!
      • 1...Qxa7
        • 2.b8Q#
        • 2.b8R#
      • 1...Qxc7
        • 2.b8S#
      • 1...Qxb7
        • 2.Bxb7#
      • 1...Qxa8
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Qxc8
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...Sc5
        • 2.cxb8S#
      • 1...Se5
        • 2.cxb8S#
      • 1...Sb6
        • 2.cxb8S#
      • 1...Sf6
        • 2.cxb8S#
      • 1...Sf8
        • 2.cxb8S#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATE,P_SPINQ(c),XS(C)::P=Q
    • Q(c);OGATE,XP(E)::P=S
    • Q(c);OGATE,P_SPINQ(c),XP(D)::B(G),XQ(c)
    • Q(c);OGATE,XR(F)::PXQ(c)=Q
    • Q(c);OGATE,XB(G)::PXQ(c)=Q
    • S(b);N_GUARD::PXQ(c)=S
  • Tries
    • Try
      • K(B);P-FLIGHT,P_SPINP(E)
      • Vars
        • Q(c);N_PINP(E),OGATE,P_SPINQ(c),XS(C)::P=Q
        • Q(c);N_PINP(E),OGATE,P_SPINQ(c),XP(D)::B(G),XQ(c)
        • Q(c);N_PINP(E),OGATE,XR(F)::PXQ(c)=Q
        • Q(c);N_PINP(E),OGATE,XB(G)::PXQ(c)=Q
        • S(b);N_GUARD::PXQ(c)=S
        • S(b);N_GUARD,N_PINP(E)::PXQ(c)=S
      • Refutation
        • Q(c);CHECK,XP(E)
  • Actual
    • K(B);P-FLIGHT
    • Vars
      • Q(c);OGATE,P_SPINQ(c),XS(C)::P=Q
      • Q(c);OGATE,XP(E)::P=S
      • Q(c);OGATE,P_SPINQ(c),XP(D)::B(G),XQ(c)
      • Q(c);OGATE,XR(F)::PXQ(c)=Q
      • Q(c);OGATE,XB(G)::PXQ(c)=Q
      • S(b);N_GUARD::PXQ(c)=S
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