MESON Chess Problem Database

Problem Display
PID: 122231 (2BqN2r/1npPPPPn/2PBk2N/8/3K4/8/8/8 w - - 0 1)

Keeble, John Frederick

Bulletin de la FFE, 1938

2BqN2r/1npPPPPn/2PBk2N/8/3K4/8/8/8

#2

10 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7
      • 2.d8S#
    • 1...Qxd7
      • 2.Bxd7#
    • 1...Qxc8
      • 2.dxc8Q#
      • 2.dxc8B#
    • 1...Qxe8
      • 2.dxe8S#
    • 1...Rg8
      • 2.fxg8Q#
      • 2.fxg8B#
    • 1...Sa5
      • 2.exd8S#
    • 1...Sc5
      • 2.exd8S#
  • Tries
    • 1.exd8Q?
      • threat
        • 2.Qe7#
      • 1...Rxe8
        • 2.dxe8Q#
        • 2.dxe8S#
        • 2.dxe8B#
        • 2.dxe8R#
      • 1...Sxd6
        • 2.Sxc7#
      • 1...cxd6
        • 2.Sc7#
      • 1...Sxd8!
    • 1.gxh8Q?
      • threat
        • 2.Qe5#
      • 1...Sf6
        • 2.Qxf6#
        • 2.f8S#
      • 1...cxd6!
  • Keys
    • 1.g8S!
      • 1...Qxe7
        • 2.d8S#
      • 1...Qxd7
        • 2.Bxd7#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Qxe8
        • 2.dxe8S#
      • 1...Rxg8
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Sxd6
        • 2.Sg7#
        • 2.exd8S#
      • 1...cxd6
        • 2.Sg7#
      • 1...Sa5
        • 2.exd8S#
      • 1...Sc5
        • 2.exd8S#
      • 1...Sg5
        • 2.f8S#
      • 1...Sf6
        • 2.f8S#
      • 1...Sf8
        • 2.exf8S#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(e);OGATE,XP(F)::P=S
    • Q(e);OGATE,P_PINB(C),P_SPINQ(e),XP(E)::B(I),XQ(e)
    • Q(e);OGATE,XB(I)::PXQ(e)=Q
    • Q(e);OGATE,XS(J)::PXQ(e)=S
    • R(f);OGATE::PXR(f)=Q
    • S(b);N_GUARD::PXQ(e)=S
  • Tries
    • Try
      • P(F);XQ(e)
      • Threat
        • QAR1(F)
      • Vars
        • S(b);SBLOCK,XB(C)::S(J),XP(c)
        • P(c);SBLOCK,XB(C)::S(J)
      • Refutation
        • S(b);XQ(F)
    • Try
      • P(H);XR(f)
      • Threat
        • QAR1(H)
      • Refutation
        • P(c);XB(C)
  • Actual
    • P(H);
    • Vars
      • Q(e);OGATE,XP(F)::P=S
      • Q(e);OGATE,P_PINB(C),P_SPINQ(e),XP(E)::B(I),XQ(e)
      • Q(e);OGATE,XB(I)::PXQ(e)=Q
      • Q(e);OGATE,XS(J)::PXQ(e)=S
      • R(f);OGATE,XS(H)::PXR(f)=Q
      • P(c);SBLOCK,XB(C)::S(J)
      • S(b);N_GUARD::PXQ(e)=S
      • S(d);N_GUARD::P=S
      • S(d);OGATE::PXS(d)=S
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