MESON Chess Problem Database

Problem Display
PID: 17912 (3Q4/n7/pr6/k7/1NP5/1K6/3B4/8 w - - 0 1)

Gooderson, Arthur R

The Problemist, 1951

3Q4/n7/pr6/k7/1NP5/1K6/3B4/8

#2

5 + 4

3713 Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Sc6#
  • Tries
    • 1.Ka3?
      • threat
        • 2.Sa2#
        • 2.Sc2#
        • 2.Sd3#
        • 2.Sd5#
        • 2.Sc6#
      • 1...Sc6
        • 2.Sxc6#
      • 1...Sb5+!
    • 1.Qg5+?
      • 1...Sb5
        • 2.Sa2#
        • 2.Sc2#
        • 2.Sd3#
        • 2.Sc6#
      • 1...Rb5!
    • 1.Qd5+?
      • 1...Sb5
        • 2.Sa2#
        • 2.Sc2#
        • 2.Sd3#
        • 2.Sc6#
      • 1...Rb5!
    • 1.c5?
      • threat
        • 2.Qxb6#
      • 1...Kb5
        • 2.Qxb6#
      • 1...Sc8!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qa1#
      • 1...Rxb4+
        • 2.Bxb4#
      • 1...Rxf6
        • 2.Sd5#
      • 1...Rc6
        • 2.Sd5#
      • 1...Rd6
        • 2.Sd5#
      • 1...Re6
        • 2.Sd5#
      • 1...Rb5
        • 2.Qxa6#
      • 1...Rb7
        • 2.Qxa6#
      • 1...Rb8
        • 2.Qxa6#
      • 1...Sb5
        • 2.Sc6#

Anticipated by 194135(1917)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(d);N_PINS(C)::B(A)+S(C),DCHECK
  • Tries
    • Try
      • K(B);N_SPINS(C),P-FLIGHT
      • Threat
        • DUALS(5)
      • Vars
        • S(d);::B(A)+S(C),DCHECK,XS(d)
      • Refutation
        • S(d);CHECK
    • Try
      • Q(E);CHECK,N_PINR(c)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(E);CHECK,N_PINR(c)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • P(D);
      • Threat
        • QAB1(E),XR(c)
      • Vars
        • K(a);N_PINS(C),N_SPINR(c),P-FLIGHT::QAR1(E),XR(c)
      • Refutation
        • S(d);
  • Actual
    • Q(E);N_PINR(c)
    • Threat
      • QAR(E)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XS(C)::B(A),XR(c)
      • R(c);N_PINS(C),XQ(E)::B(A)+S(C)
      • R(c);N_PINS(C)::B(A)+S(C)
      • R(c);OGATE::QAR1(E),XP(b)
      • S(d);N_PINS(C)::B(A)+S(C),DCHECK
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