MESON Chess Problem Database

Problem Display
PID: 52225 (8/1rb1Q2K/1p2N2N/8/2P1k2n/3n2B1/2PP1R2/8 w - - 0 1)

Howard, Kenneth Samuel

The Observer, 1926

(First published on Sun Nov 21 1926)

8/1rb1Q2K/1p2N2N/8/2P1k2n/3n2B1/2PP1R2/8

#2

9 + 6

5089 The Enjoyment of Chess Problems 1943
5064 100 Years of the American Two-move Chess Problem 1962
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qxb7#
    • 1...Bd6
      • 2.Qxb7#
    • 1...Bb8
      • 2.Qxb7#
    • 1...Bd8
      • 2.Qxb7#
    • 1...Se5
      • 2.Rf4#
    • 1...Sf3
      • 2.Re2#
  • Tries
    • 1.Sxc7+?
      • 1...Se5
        • 2.Rf4#
        • 2.Qxe5#
      • 1...Kd4!
    • 1.Qg7?
      • threat
        • 2.Sg5#
        • 2.Qd4#
      • 1...Bxg3
        • 2.Sg5#
      • 1...Sxf2
        • 2.Sg5#
      • 1...Be5
        • 2.Qxb7#
      • 1...Bd6
        • 2.Sg5#
        • 2.Qxb7#
      • 1...Bb8
        • 2.Sg5#
        • 2.Qxb7#
      • 1...Bd8
        • 2.Qxb7#
      • 1...Se5
        • 2.Rf4#
      • 1...Sf3
        • 2.Re2#
        • 2.Qg6#
      • 1...Sf5
        • 2.Sg5#
      • 1...Bf4!
  • Keys
    • 1.Be5!
      • threat
        • 2.Sg5#
      • 1...Kxe5
        • 2.Re2#
      • 1...Bxe5
        • 2.Qxb7#
      • 1...Sxe5
        • 2.Rf4#
      • 1...Sf3
        • 2.Re2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(f);OGATE,P_PINQ(H)::QAB(H),XR(e)
    • S(a);N_GUARD,SBLOCK,S_CUTB(f)::R1(C)
    • S(c);SBLOCK::R(C)
  • Tries
    • Try
      • S(F);CHECK,XB(f)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);P_PINQ(H),XB(D)::S(F)
        • S(a);XR(C)::S(F)
        • B(f);OGATE,P_PINQ(H)::QAB(H),XR(e)
        • S(a);N_GUARD,S_CUTB(f)::R1(C)
        • S(c);::S(F)
      • Refutation
        • B(f);P_PINQ(H)
  • Actual
    • B(D);
    • Threat
      • S(F)
    • Vars
      • K(b);P-FLIGHT,XB(D)::R(C)
      • B(f);OGATE,P_PINQ(H),SBLOCK,XB(D)::QAB(H),XR(e)
      • S(a);N_GUARD,SBLOCK,XB(D)::R1(C)
      • S(c);SBLOCK::R(C)
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