MESON Chess Problem Database

Problem Display
PID: 145099 (3BB1Nn/4Q3/1P6/2pk2pR/5pK1/2pp4/7b/1R6 w - - 0 1)

O'Shea, Patrick

The Problemist, 1996

3BB1Nn/4Q3/1P6/2pk2pR/5pK1/2pp4/7b/1R6

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe4#
  • Tries
    • 1.Bc6+?
      • 1...Kc4
        • 2.Qe4#
      • 1...Kd4
        • 2.Qe4#
      • 1...Kxc6!
    • 1.Rxg5+?
      • 1...Kc4
        • 2.Qxc5#
        • 2.Qe4#
      • 1...Kd4!
    • 1.Qxc5+?
      • 1...Ke4
        • 2.Sf6#
        • 2.Bc6#
        • 2.Re1#
        • 2.Rb4#
      • 1...Ke6
        • 2.Re1#
      • 1...Kxc5!
    • 1.Qxg5+?
      • 1...Kc4
        • 2.Qxc5#
        • 2.Qd5#
      • 1...Ke4
        • 2.Qe5#
      • 1...Kd6
        • 2.Qf6#
        • 2.Qe7#
        • 2.Qd5#
        • 2.Qe5#
      • 1...Ke6
        • 2.Qf6#
        • 2.Qe7#
        • 2.Qd5#
        • 2.Qe5#
      • 1...Kd4!
    • 1.Qd6+?
      • 1...Kc4
        • 2.Bb5#
      • 1...Ke4
        • 2.Re1#
      • 1...Kxd6!
    • 1.Qe4+?
      • 1...Kd6
        • 2.Bc7#
        • 2.Be7#
      • 1...Kxe4!
    • 1.Qe5+?
      • 1...Kc4
        • 2.Bb5#
        • 2.Qe4#
      • 1...Kxe5!
    • 1.Qe6+?
      • 1...Kd4
        • 2.Bf6#
      • 1...Kxe6!
    • 1.Qd7+?
      • 1...Ke4
        • 2.Re1#
      • 1...Ke5
        • 2.Re1#
      • 1...Kc4!
  • Keys
    • 1.Sf6+!
      • 1...Kc4
        • 2.Qe4#
      • 1...Kd4
        • 2.Qe4#

This is after

After M. Zigman.

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINP(g),S_FLIGHT::QAR2(E)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • K(f);N_SPINP(g),S_FLIGHT::QAR2(E)
        • K(f);N_SPINP(g),P-FLIGHT::QAR1(E)
      • Refutation
        • K(f);N_SPINP(g),S_FLIGHT,XB(G)
    • Try
      • R(C);CHECK,XP(g)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • Q(E);CHECK,XP(e)
      • Vars
        • K(f);N_SPINP(g),S_FLIGHT::R(A)
      • Refutation
        • K(f);P-FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK,XP(g)
      • Vars
        • K(f);S_FLIGHT::QAR1(E)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);N_SPINP(g),S_FLIGHT::B(G)
        • K(f);N_SPINP(g),S_FLIGHT::R(A)
      • Refutation
        • K(f);N_SPINP(g),P-FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(f);N_SPINP(g),S_FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK,N_PINP(g)
      • Refutation
        • K(f);P-FLIGHT,P_SPINP(g),XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);N_SPINP(g),P-FLIGHT::B(F)
      • Refutation
        • K(f);N_SPINP(g),S_FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);N_SPINP(g),S_FLIGHT::R(A)
        • K(f);P-FLIGHT::R(A)
      • Refutation
        • K(f);N_SPINP(g),S_FLIGHT
  • Actual
    • S(H);CHECK
    • Vars
      • K(f);N_SPINP(g),S_FLIGHT::QAR2(E)
      • K(f);N_SPINP(g),P-FLIGHT::QAR1(E)
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