MESON Chess Problem Database

Problem Display
PID: 80761 (3K1n2/6Bp/nNpk4/1pN3p1/1p3p2/7R/3rpQ2/8 w - - 0 1)

Welburn, T

The Field, 1948

(First published on Sat Aug 21 1948)

3K1n2/6Bp/nNpk4/1pN3p1/1p3p2/7R/3rpQ2/8

#2

6 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Rd3#
      • 2.Qd4#
    • 1...Rb2
      • 2.Rd3#
      • 2.Qd4#
    • 1...Rc2
      • 2.Rd3#
      • 2.Qd4#
    • 1...Rd3
      • 2.Rxd3#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rd5
      • 2.Sc8#
  • Tries
    • 1.Rh6+?
      • 1...Se6+
        • 2.Rxe6#
      • 1...Sg6!
  • Keys
    • 1.Re3!
      • threat
        • 2.Sb7#
        • 2.Bxf8#
      • 1...Kxc5+
        • 2.Rd3#
      • 1...Se6+
        • 2.Rxe6#
      • 1...Sxc5
        • 2.Bxf8#
      • 1...fxe3
        • 2.Qxf8#
      • 1...Sg6
        • 2.Sb7#
        • 2.Re6#
      • 1...Sd7
        • 2.Sb7#
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(a);N_GUARD::R(B),XR(a)
    • R(a);N_GUARD::QAR2(A),XR(a)
    • R(a);SBLOCK::S(D)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • S(k);CHECK,N_GUARD,P_SPINS(k)::R1(B),XS(k)
      • Refutation
        • S(k);P_SPINS(k)
  • Actual
    • R(B);
    • Threat
      • DUALS(2)
    • Vars
      • K(i);CHECK,S_FLIGHT,XS(C)::QAB(A)+R(B)
      • S(k);CHECK,N_GUARD::R1(B),XS(k)
      • S(g);SBLOCK,XS(C)::B(E),XS(k)
      • P(d);OGATE,XR(B)::QAB(A),XS(k)
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