MESON Chess Problem Database

Problem Display
PID: 28689 (k5K1/5Q2/3n4/6R1/4R3/8/8/8 w - - 0 1)

Ferguson, Robin

Echec+, 1992

k5K1/5Q2/3n4/6R1/4R3/8/8/8

#2

4 + 2

3248 Miniatures canadiennes 2000
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Re8#
    • 1...Sb5
      • 2.Re8#
    • 1...Sf5
      • 2.Re8#
    • 1...Se8
      • 2.Rxe8#
  • Tries
    • 1.Rb4?
      • threat
        • 2.Ra5#
        • 2.Qa2#
      • 1...Sxf7
        • 2.Ra5#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sc4
        • 2.Qb7#
      • 1...Sf5
        • 2.Qa2#
        • 2.Qb7#
      • 1...Sc8
        • 2.Qb7#
      • 1...Sb5!
    • 1.Re8+?
      • 1...Sc8
        • 2.Rxc8#
      • 1...Sxe8!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Ra4#
        • 2.Qa2#
      • 1...Sxe4
        • 2.Qa2#
        • 2.Qb7#
      • 1...Sxb5
        • 2.Re8#
      • 1...Sxf7
        • 2.Ra4#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sc4
        • 2.Re8#
        • 2.Qb7#
      • 1...Sc8
        • 2.Qb7#

Anticipated by 3218(1987)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::R(A)
    • S(a);N_GUARD::R(A),XS(a)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);XQ(C)::R(B)
        • S(a);N_GUARD::QAB1(C),XS(a)
        • S(a);N_GUARD::QAB1(C)
      • Refutation
        • S(a);
    • Try
      • R(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::R(A),XS(a)
      • Refutation
        • S(a);XR(A)
  • Actual
    • R(B);
    • Threat
      • DUALS(2)
    • Vars
      • S(a);N_GUARD,XR(B)::R(A)
      • S(a);XQ(C)::R(A)
      • S(a);N_GUARD::QAB1(C),XS(a)
      • S(a);N_GUARD::QAB1(C)
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