MESON Chess Problem Database

Problem Display
PID: 71148 (4Q3/4R3/3pNp2/4p3/4k3/4P3/1N2R1K1/8 w - - 0 1)

Alexander, Frederick Forrest Lawrie

Chess, 1951

4Q3/4R3/3pNp2/4p3/4k3/4P3/1N2R1K1/8

#2

7 + 4

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qa8#
      • 2.e4#
  • Tries
    • 1.Sf4?
      • 1...Kf5
        • 2.Qg6#
      • 1...f5
        • 2.Qa4#
      • 1...d5!
    • 1.Qa4+?
      • 1...Kd5
        • 2.Rd2#
        • 2.Qc4#
        • 2.Qa8#
        • 2.e4#
      • 1...Kf5!
    • 1.Qc6+?
      • 1...d5
        • 2.Qc2#
      • 1...Kf5!
    • 1.Qc8?
      • 1...Kd5
        • 2.Qb7#
        • 2.Qc4#
        • 2.Qa8#
        • 2.e4#
      • 1...d5
        • 2.Sc5#
        • 2.Qc2#
      • 1...f5
        • 2.Qc4#
      • 1...Kf5!
  • Keys
    • 1.Qg8!
      • 1...Kd5
        • 2.Qa8#
      • 1...Kf5
        • 2.e4#
      • 1...d5
        • 2.Qg4#
      • 1...f5
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB1(G)
        • P(d);SBLOCK::QAR(G)
      • Refutation
        • P(c);
    • Try
      • Q(G);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • P(c);P_SPINP(c),SBLOCK::QAB(G)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(G);
      • Vars
        • P(d);SBLOCK::QAR2(G)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(G);
    • Vars
      • K(a);S_FLIGHT::QAB(G)
      • K(a);OGATE,S_FLIGHT::P(D)
      • P(c);SBLOCK::QAR2(G)
      • P(d);N_GUARD,SBLOCK::S(E)
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