MESON Chess Problem Database

Problem Display
PID: 22016 (8/8/5NN1/3P1kpQ/K7/5r2/5R2/B5n1 w - - 0 1)

Stubbs, Arthur Goodwin

1st Prize, Good Companions, 1923

8/8/5NN1/3P1kpQ/K7/5r2/5R2/B5n1

#2

7 + 4

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4+
      • 2.Rxf4#
  • Tries
    • 1.Se4?
      • threat
        • 2.Sg3#
        • 2.Sd6#
      • 1...Se2
        • 2.Sd6#
      • 1...Rf4
        • 2.Rxf4#
      • 1...Kxe4!
    • 1.Se8?
      • threat
        • 2.Sd6#
      • 1...Rf4+
        • 2.Rxf4#
      • 1...Ke4!
    • 1.Qh2?
      • threat
        • 2.Se7#
      • 1...Kxg6
        • 2.Qh7#
      • 1...g4
        • 2.Qh5#
      • 1...Rf4+!
    • 1.Qh3+?
      • 1...Kxg6
        • 2.Qh7#
      • 1...g4
        • 2.Qxg4#
        • 2.Qh5#
      • 1...Sxh3!
  • Keys
    • 1.Qh1!
      • 1...Rf4+
        • 2.Qe4#
      • 1...Kxg6
        • 2.Qh7#
      • 1...Rxf2
        • 2.Qe4#
      • 1...g4
        • 2.Qh5#
      • 1...Se2
        • 2.Qb1#
      • 1...Sh3
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(b);CHECK,OGATE::R1(B),XR(b)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(F)
        • R(b);OGATE,P_PINS(F)::R1(B),XR(b)
      • Refutation
        • K(c);N_SPINP(d),N_SPINR(b),S_FLIGHT,XS(F)
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • R(b);CHECK,OGATE::R1(B),XR(b)
      • Refutation
        • K(c);N_SPINP(d),N_SPINR(b),S_FLIGHT
    • Try
      • Q(E);N_PINP(d)
      • Threat
        • S(G)
      • Vars
        • K(c);N_SPINR(b),OGATEB,S_FLIGHT,XS(G)::QAB1(E)
        • P(d);OGATEB::QAR2(E)
      • Refutation
        • R(b);CHECK
    • Try
      • Q(E);CHECK,N_PINP(d)
      • Vars
        • K(c);N_SPINR(b),OGATEB,S_FLIGHT,XS(G)::QAB1(E)
      • Refutation
        • S(a);XQ(E)
  • Actual
    • Q(E);N_PINP(d)
    • Vars
      • R(b);CHECK,OGATE::QAB1(E)
      • K(c);N_SPINR(b),OGATEB,S_FLIGHT,XS(G)::QAB1(E)
      • R(b);N_SPINR(b),OGATE,XR(B)::QAB1(E)
      • P(d);OGATEB::QAR2(E)
      • S(a);OGATE::QAB(E)
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