MESON Chess Problem Database

Problem Display
PID: 278450 (1K6/5Q2/1R6/4p3/8/NPp5/kpqp4/bb1B4 w - - 0 1)

Petite, Efren

Phenix, 2011

1K6/5Q2/1R6/4p3/8/NPp5/kpqp4/bb1B4

#2

6 + 8

15601 Albrecht-Leiss-Degener Collection 2024
5454 Near Snap 2024
3713 Snap 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa3
      • 2.Qa7#
    • 1...Qxb3
      • 2.Qxb3#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Ra6#
      • 1...Qg6
        • 2.Qa7#
      • 1...Qe4!
    • 1.Ra6?
      • threat
        • 2.Sxc2#
        • 2.Sb5#
      • 1...Qxb3+
        • 2.Sb5#
        • 2.Bxb3#
        • 2.Qxb3#
      • 1...Qxd1
        • 2.Sc2#
        • 2.Sb5#
      • 1...Qd3
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qe4
        • 2.Sc4#
      • 1...Qf5
        • 2.Sc2#
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qh7
        • 2.Sc2#
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qc1
        • 2.Sc2#
        • 2.Sc4#
        • 2.Sb5#
        • 2.b4#
      • 1...Qg6!
    • 1.Qa7?
      • threat
        • 2.Sxc2#
        • 2.Sc4#
      • 1...Qxd1
        • 2.Sc2#
        • 2.Sc4#
      • 1...Qxb3
        • 2.Bxb3#
      • 1...Qd3
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qe4
        • 2.Sc4#
      • 1...Qf5
        • 2.Sc2#
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qg6
        • 2.Sc2#
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qc1
        • 2.Sc2#
        • 2.Sc4#
        • 2.Sb5#
      • 1...Qh7!
    • 1.b4+?
      • 1...Qb3
        • 2.Qxb3#
      • 1...Kxa3!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Qa7#
      • 1...Qxb3
        • 2.Bxb3#
      • 1...Qh7
        • 2.Ra6#

Anticipated by 23242(1996), 168302(1998)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(c);OGATEB,P-FLIGHT,XS(B)::QAR(E)
    • Q(e);OGATE,P_PINR(D),P_SPINQ(e),XP(C)::QAB1(E),XQ(e)
  • Tries
    • Try
      • S(B);
      • Threat
        • R(D)
      • Vars
        • Q(e);::QAR(E)
      • Refutation
        • Q(e);
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);::R(D)+S(B)
      • Refutation
        • Q(e);
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);OGATE,P_PINR(D),XP(C)::B(A),XQ(e)
        • Q(e);::QAR(E)+S(B)
      • Refutation
        • Q(e);
    • Try
      • P(C);CHECK
      • Vars
        • Q(e);N_GUARD,P_SPINQ(e)::QAB1(E),XQ(e)
      • Refutation
        • K(c);P-FLIGHT,XS(B)
  • Actual
    • S(B);
    • Threat
      • QAR(E)
    • Vars
      • Q(e);OGATE,P_PINR(D),XP(C)::B(A),XQ(e)
      • Q(e);::R(D)
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