MESON Chess Problem Database

Problem Display
PID: 582 (2QBNR1q/2PPPPnp/3pk2K/5p1B/2P2p2/5N2/8/8 w - - 0 1)

Morse, Christopher Jeremy

5th HM., The Observer, 1965

2QBNR1q/2PPPPnp/3pk2K/5p1B/2P2p2/5N2/8/8

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf8
      • 2.exf8S#
    • 1...Qg8
      • 2.fxg8Q#
      • 2.fxg8B#
    • 1...Sxe8
      • 2.dxe8S#
  • Tries
    • 1.Sxg7+?
      • 1...Kf6
        • 2.e8Q#
        • 2.e8S#
        • 2.e8B#
        • 2.e8R#
      • 1...Qxg7+!
    • 1.Rg8?
      • threat
        • 2.f8S#
      • 1...Qxg8
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Sxe8
        • 2.dxe8S#
      • 1...Sxh5!
    • 1.Rxh8?
      • threat
        • 2.f8S#
      • 1...Sxe8
        • 2.dxe8S#
      • 1...Sxh5!
    • 1.Qa6?
      • threat
        • 2.Qxd6#
      • 1...Kxd7
        • 2.c8Q#
        • 2.c8B#
      • 1...Sxe8!
  • Keys
    • 1.Sf6!
      • 1...Kxf6
        • 2.e8Q#
        • 2.e8R#
      • 1...Qxf8
        • 2.exf8S#
      • 1...Sxh5
        • 2.e8Q#
        • 2.e8R#
      • 1...d5
        • 2.Qa6#
      • 1...Qg8
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Se8
        • 2.dxe8S#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE,XR(L)::PXQ(g)=S
    • Q(g);OGATE::PXQ(g)=Q
    • S(e);OGATE,XS(K)::PXS(e)=S
  • Tries
    • Try
      • S(K);CHECK,XS(e)
      • Refutation
        • Q(g);CHECK,XS(K)
    • Try
      • R(L);
      • Threat
        • P=S
      • Vars
        • Q(g);OGATE,XR(L)::PXQ(g)=Q
        • S(e);OGATE,XS(K)::PXS(e)=S
      • Refutation
        • S(e);XB(C)
    • Try
      • R(L);XQ(g)
      • Threat
        • P=S
      • Vars
        • S(e);OGATE,XS(K)::PXS(e)=S
      • Refutation
        • S(e);XB(C)
    • Try
      • Q(I);P_PINP(c)
      • Threat
        • QAR1(I),XP(c)
      • Vars
        • K(d);N_SPINP(c),S_FLIGHT,XP(F)::P=Q
      • Refutation
        • S(e);XS(K)
  • Actual
    • S(K);
    • Vars
      • K(d);P-FLIGHT,XS(K)::P=Q
      • Q(g);OGATE,XR(L)::PXQ(g)=S
      • S(e);N_GUARD,XB(C)::P=Q
      • P(c);OGATEB::QAR(I)
      • Q(g);OGATE::PXQ(g)=Q
      • S(e);OGATE::PXS(e)=S
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