MESON Chess Problem Database

Problem Display
PID: 354 (8/8/8/5p1p/5Nbp/3pPPkP/3N4/4K2R w K - 0 1)

Stuart Green, G

The Observer, 1929

(First published on Sun Oct 13 1929)

8/8/8/5p1p/5Nbp/3pPPkP/3N4/4K2R

#2

7 + 6

887 Mate in Two Moves 1931
273 Mat Plus 1995
5454 Near Snap 2007
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf3
      • 2.Sf1#
    • 1...Bxh3
      • 2.Rxh3#
  • Tries
    • 1.Kf1?
      • 1...Bxh3+
        • 2.Rxh3#
      • 1...Bxf3!
    • 1.Rh2?
      • threat
        • 2.Rg2#
      • 1...Bxf3
        • 2.Sf1#
      • 1...Bxh3
        • 2.Rxh3#
      • 1...Kxh2!
  • Keys
    • 1.0-0!
      • 1...Bxf3
        • 2.Rxf3#
      • 1...Bxh3
        • 2.Sxh5#

This anticipates 49642(1995)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK,XP(E)::S(C)
    • B(c);OGATE,XP(F)::R1(B),XB(c)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • B(c);CHECK,OGATE,XP(F)::R1(B),XB(c)
      • Refutation
        • B(c);XP(E)
    • Try
      • R(B);
      • Threat
        • R1(B)
      • Vars
        • B(c);SBLOCK,XP(E)::S(C)
        • B(c);OGATE,XP(F)::R1(B),XB(c)
      • Refutation
        • K(b);S_FLIGHT,XR(B)
  • Actual
    • K(A);0-0
    • Vars
      • B(c);OGATE,XP(E)::R1(B),XB(c)
      • B(c);N_GUARD,SBLOCK,XP(F)::S(G),XP(f)
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