MESON Chess Problem Database

Problem Display
PID: 436 (3N4/R2n2K1/1Ppk1P2/8/1Pn3P1/2N2B2/1Q6/3r2B1 w - - 0 1)

Gooderson, Arthur R

The Observer, 1952

(First published on Sun Jul 13 1952)

3N4/R2n2K1/1Ppk1P2/8/1Pn3P1/2N2B2/1Q6/3r2B1

#2

11 + 5

3207 A R Gooderson An English Progressive 1996
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qh2#
    • 1...Rd5
      • 2.Se4#
    • 1...Se5
      • 2.Bc5#
    • 1...c5
      • 2.Sb5#
  • Tries
    • 1.Bc5+?
      • 1...Ke5
        • 2.Qh2#
      • 1...Sxc5!
    • 1.Rxd7+?
      • 1...Ke5
        • 2.Bh2#
        • 2.Qh2#
      • 1...Kxd7!
    • 1.Qh2+?
      • 1...Sde5
        • 2.Bc5#
      • 1...Sce5!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Sf7#
      • 1...Ke5
        • 2.Qh2#
      • 1...Rxd5
        • 2.Se4#
      • 1...cxd5
        • 2.Sb5#
      • 1...Sce5
        • 2.Sb7#
      • 1...Sde5
        • 2.Bc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(d);S_FLIGHT::QAB(B)
    • R(a);SBLOCK::S(C)
    • S(e);N_GUARD,SBLOCK::B(A)
    • P(c);N_GUARD::S(C)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB(B)
      • Refutation
        • S(e);XB(A)
    • Try
      • R(I);CHECK,XS(e)
      • Refutation
        • K(d);P-FLIGHT,XR(I)
    • Try
      • Q(B);CHECK
      • Vars
        • S(e);P_SPINS(e)::B(A)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • B(D);
    • Threat
      • S(K)
    • Vars
      • K(d);S_FLIGHT::QAB(B)
      • R(a);SBLOCK,XB(D)::S(C)
      • P(c);N_GUARD,SBLOCK,XB(D)::S(C)
      • S(b);SBLOCK::S(K)
      • S(e);N_GUARD,SBLOCK::B(A)
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