MESON Chess Problem Database

Problem Display
PID: 243102 (8/4Q3/8/pp6/kP6/8/K7/n7 w - - 0 1)

Armeni, Alberto

ChessStar, 2011

8/4Q3/8/pp6/kP6/8/K7/n7

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...axb4
      • 2.Qa7#
  • Tries
    • 1.Qd8?
      • threat
        • 2.Qxa5#
      • 1...Kxb4
        • 2.Qd4#
      • 1...axb4
        • 2.Qa8#
      • 1...Sb3!
    • 1.Qe6?
      • 1...axb4
        • 2.Qa6#
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Kxb4!
    • 1.Qa7?
      • threat
        • 2.Qxa5#
      • 1...Kxb4
        • 2.Qd4#
      • 1...Sb3!
    • 1.Qf7?
      • 1...axb4
        • 2.Qa7#
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Kxb4!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qa3#
      • 1...Kxb4
        • 2.Qd4#
      • 1...axb4
        • 2.Qa7#
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
        • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Vars
        • P(c);OGATEB,SBLOCK,XP(B)::QAR2(C)
        • S(a);N_GUARD::QAB1(C)
        • S(a);N_GUARD::QAB1(C),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • K(b);N_SPINP(c),OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Vars
        • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
        • S(a);N_GUARD::QAB1(C)
        • S(a);N_GUARD::QAB1(C),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
      • S(a);N_GUARD::QAB1(C)
      • S(a);N_GUARD::QAB1(C),XS(a)
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