MESON Chess Problem Database

Problem Display
PID: 233386 (3B4/3p4/4P3/4k1N1/8/3Q1K2/8/8 w - - 0 1)

Benko, Pal Charles

Chess Life, 1980

3B4/3p4/4P3/4k1N1/8/3Q1K2/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...dxe6
      • 2.Sf7#
    • 1...d6
      • 2.Qe4#
  • Tries
    • 1.Ke3?
      • 1...dxe6
        • 2.Sf3#
        • 2.Sf7#
      • 1...d6
        • 2.Qe4#
      • 1...d5!
    • 1.Kg3?
      • 1...dxe6
        • 2.Sf3#
        • 2.Sf7#
      • 1...d6
        • 2.Qe4#
      • 1...d5!
    • 1.Kg4?
      • 1...dxe6
        • 2.Sf3#
        • 2.Sf7#
      • 1...d6
        • 2.Qe4#
      • 1...d5!
    • 1.Qd4+?
      • 1...Kf5
        • 2.Qf6#
        • 2.Qe4#
      • 1...Kxd4!
  • Keys
    • 1.Qc4!
      • 1...Kf5
        • 2.Qe4#
      • 1...Kd6
        • 2.Sf7#
      • 1...dxe6
        • 2.Qc5#
      • 1...d5
        • 2.Qf4#
      • 1...d6
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK,XP(D)::S(C)
    • P(b);SBLOCK::QAR1(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • P(b);SBLOCK::QAR1(A)
      • Refutation
        • P(b);
    • Try
      • K(B);P-FLIGHT
      • Vars
        • P(b);SBLOCK::QAR1(A)
      • Refutation
        • P(b);
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(b);SBLOCK::QAR1(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(a);P-FLIGHT::QAB1(A)
      • K(a);S_FLIGHT::S(C)
      • P(b);N_GUARD,XP(D)::QAR2(A)
      • P(b);SBLOCK::QAB1(A)
      • P(b);SBLOCK::QAR1(A)
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