MESON Chess Problem Database

Problem Display
PID: 181773 (2K2Q2/8/kp6/P7/2P5/8/8/8 w - - 0 1)

Fraisse, A

La Strategie, 1905

2K2Q2/8/kp6/P7/2P5/8/8/8

#2

4 + 2

6490 yacpdb 2018
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa5
      • 2.Qa3#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Qa8#
      • 1...Kxa5
        • 2.Qa3#
      • 1...Ka7!
    • 1.Kb8?
      • 1...Kxa5
        • 2.Qa3#
      • 1...bxa5
        • 2.Qd6#
        • 2.Qh6#
        • 2.Qf6#
      • 1...b5!
    • 1.Qd6?
      • threat
        • 2.Qxb6#
      • 1...Kxa5
        • 2.Qa3#
      • 1...Ka7!
    • 1.Qe7?
      • 1...Kxa5
        • 2.Qa3#
      • 1...bxa5
        • 2.Qb7#
      • 1...b5!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qa8#
      • 1...Kxa5
        • 2.Qa3#
      • 1...Ka7
        • 2.Qb7#
      • 1...bxa5
        • 2.Qb7#

This anticipates 95242(1941), 102882(1953), 230972(2006)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,P-FLIGHT,XP(B)::QAR2(D)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAR2(D)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(B)::QAR2(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(B)::QAR2(D)
      • Refutation
        • P(b);
    • Try
      • Q(D);P_PINP(b)
      • Threat
        • QAR1(D),XP(b)
      • Vars
        • K(a);N_SPINP(b),OGATEB,P-FLIGHT,XP(B)::QAR2(D)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(B)::QAR2(D)
        • P(b);SBLOCK,XP(B)::QAB1(D)
      • Refutation
        • P(b);
  • Actual
    • Q(D);
    • Threat
      • QAR2(D)
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(B)::QAR2(D)
      • K(a);P-FLIGHT::QAR1(D)
      • P(b);SBLOCK,XP(B)::QAB1(D)
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