MESON Chess Problem Database

Problem Display
PID: 51826 (1b1Q4/3R4/4rpp1/6pN/3Pk3/1n4RB/2Pr1BPK/5N2 w - - 0 1)

Howard, Kenneth Samuel

The Observer, 1935

(First published on Sun Sep 8 1935)

1b1Q4/3R4/4rpp1/6pN/3Pk3/1n4RB/2Pr1BPK/5N2

#2

11 + 8

5089 The Enjoyment of Chess Problems 1943
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.cxd3#
    • 1...Re5
      • 2.Re3#
    • 1...Bxg3+
      • 2.Sfxg3#
    • 1...Bd6
      • 2.Qa8#
    • 1...Ba7
      • 2.Re3#
    • 1...Sa1
      • 2.Sxd2#
    • 1...Sc1
      • 2.Sxd2#
    • 1...Sa5
      • 2.Sxd2#
    • 1...Sc5
      • 2.Sxd2#
  • Tries
    • 1.Sxf6+?
      • 1...Kf4
        • 2.Rf3#
      • 1...Rxf6!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qd5#
      • 1...Bxg3+
        • 2.Sfxg3#
      • 1...Rxd4
        • 2.Qe1#
      • 1...Sxa5
        • 2.Sxd2#
      • 1...gxh5
        • 2.Qf5#
      • 1...Re5
        • 2.Re3#
      • 1...Rd6
        • 2.Rg4#
      • 1...Bd6
        • 2.Qa8#
      • 1...Sc5
        • 2.Sxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(a);OGATE::P(B),XR(a)
    • R(e);N_PINR(F)::R1(F)
    • B(h);CHECK,XR(F)::S(A),XB(h)
    • B(h);OGATE::QAB(K)
    • B(h);N_PINR(F)::R1(F)
    • S(b);N_GUARD::S(A),XR(a)
  • Tries
    • Try
      • S(I);CHECK,XP(f)
      • Vars
        • K(c);N_PINR(F),P-FLIGHT::R1(F)
      • Refutation
        • R(e);XS(I)
  • Actual
    • Q(K);
    • Threat
      • QAB1(K)
    • Vars
      • B(h);CHECK,XR(F)::S(A),XB(h)
      • R(a);OGATE,XP(H)::QAR(K)
      • S(b);N_GUARD,XQ(K)::S(A),XR(a)
      • P(g);N_GUARD,XS(I)::QAB1(K)
      • R(e);N_PINR(F)::R1(F)
      • R(e);N_PINR(F)::R(F)
      • B(h);S_CUTR(e)::QAB(K)
      • S(b);N_GUARD::S(A),XR(a)
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