MESON Chess Problem Database

Problem Display
PID: 17450 (3Qn3/KRrp4/8/k7/b1PN4/2P5/3B3b/R5q1 w - - 0 1)

Gooderson, Arthur R

The Problemist, 1946

3Qn3/KRrp4/8/k7/b1PN4/2P5/3B3b/R5q1

#2

8 + 7

3207 A R Gooderson An English Progressive 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.cxd4#
    • 1...Qc1
      • 2.Sb3#
    • 1...Qe1
      • 2.Sb3#
    • 1...Qf1
      • 2.Sb3#
    • 1...Qh1
      • 2.Sb3#
    • 1...Qg2
      • 2.Sb3#
    • 1...Qg3
      • 2.Sb3#
    • 1...Qg4
      • 2.Sb3#
    • 1...Qg5
      • 2.Sb3#
    • 1...Qg6
      • 2.Sb3#
    • 1...Qg7
      • 2.Sb3#
    • 1...Qg8
      • 2.Sb3#
    • 1...Sd6
      • 2.Qxc7#
  • Tries
    • 1.Qxc7+?
      • 1...Bxc7
        • 2.Rb5#
      • 1...Sxc7!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Kb8#
      • 1...Qxd4+
        • 2.cxd4#
      • 1...Rxb7+
        • 2.Kxb7#
      • 1...Rxc4
        • 2.Rb5#
      • 1...Qg6
        • 2.Sb3#
      • 1...Rc5
        • 2.Sb3#
      • 1...Rc6
        • 2.Rb5#
      • 1...Rc8
        • 2.Rb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 11
  • Sets
    • Q(a);CHECK,OGATE,XS(E)::B(B)+P(C),XQ(a)
    • Q(a);N_PINS(E)::S(E)
    • S(g);N_GUARD,S_CUTB(b)::QAB(H),XR(e)
  • Tries
    • Try
      • Q(H);CHECK,N_SPINR(G),XR(e)
      • Vars
        • B(b);XQ(H)::R1(G)
      • Refutation
        • S(g);XQ(H)
  • Actual
    • Q(H);N_PINR(e)
    • Threat
      • QAR(H)+K(F)
    • Vars
      • Q(a);CHECK,OGATE,XS(E)::B(B)+P(C),XQ(a)
      • R(e);CHECK,XR(G)::QAR(H)+K(F),XR(e)
      • R(e);N_PINR(G),XP(D)::R1(G)
      • Q(a);N_PINS(E)::S(E)
      • R(e);N_PINR(G),N_PINS(E)::S(E)
      • R(e);N_PINR(G)::R1(G)
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