MESON Chess Problem Database

Problem Display
PID: 190295 (B7/qr2QKPp/1n2NR2/1p3R2/3pk1P1/3r4/b1Pn1P2/2b2N2 w - - 0 1)

Wallis, Walter Warren

The Observer, 1938

(First published on Sun Apr 3 1938)

B7/qr2QKPp/1n2NR2/1p3R2/3pk1P1/3r4/b1Pn1P2/2b2N2

#2

11 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sd8#
      • 2.Sf8#
    • 1...Rg3
      • 2.Sxg3#
    • 1...Bb1
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sd8#
      • 2.Sf8#
    • 1...Bxe6+
      • 2.Rxe6#
    • 1...Sb3
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sc7#
      • 2.Sd8#
      • 2.Sf8#
    • 1...Sf3
      • 2.Sg3#
    • 1...Sdc4
      • 2.Sc5#
      • 2.Sg5#
    • 1...Sbc4
      • 2.Sc5#
      • 2.Sg5#
    • 1...Sd5
      • 2.Sc5#
      • 2.Sg5#
  • Tries
    • 1.Rf4+?
      • 1...Ke5
        • 2.R6f5#
      • 1...Kd5!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Re5#
      • 1...Bxe6+
        • 2.Rxe6#
      • 1...Sf3
        • 2.Sg3#
      • 1...Sdc4
        • 2.Sc5#
      • 1...Sbc4
        • 2.Sg5#
      • 1...Sd7
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(d);N_GUARD::S(A),XR(d)
    • B(b);CHECK,OGATE,P_SPINB(b),XS(F)::R(G),XB(b)
    • S(c);S_CUTR(d)::S(A)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(f);N_SPINR(j),P-FLIGHT::R1(G)
      • Refutation
        • K(f);N_PINS(F),S_FLIGHT
  • Actual
    • Q(H);
    • Threat
      • R1(E)
    • Vars
      • B(b);CHECK,OGATE,XS(F)::R(G),XB(b)
      • S(c);S_CUTR(d)::S(A)
      • S(c);N_PINS(F)::S(F)
      • S(h);N_PINS(F)::S(F)
      • S(h);N_PINQ(H)::QAR1(H)
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