MESON Chess Problem Database

Problem Display
PID: 140856 (8/2Qb4/kqP5/1N6/PKP5/3N4/8/8 w - - 0 1)

Strebkovs, Andrejs

Source?, 0000

8/2Qb4/kqP5/1N6/PKP5/3N4/8/8

#2

7 + 3

6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qa5#
      • 2.Qb7#
    • 1...Qf2
      • 2.Qa5#
      • 2.Qb7#
    • 1...Qe3
      • 2.Qa5#
      • 2.Qb7#
    • 1...Qd4
      • 2.Qa5#
      • 2.Qb7#
    • 1...Qa5+
      • 2.Qxa5#
    • 1...Qc5+
      • 2.Sxc5#
    • 1...Qa7
      • 2.Qa5#
      • 2.Qxa7#
    • 1...Qxb5+
      • 2.axb5#
      • 2.cxb5#
    • 1...Qxc6
      • 2.Qa7#
    • 1...Qb7
      • 2.Sc5#
      • 2.Qa5#
      • 2.Qxb7#
    • 1...Qb8
      • 2.Sc5#
      • 2.Qa5#
  • Tries
    • 1.Qc8+?
      • 1...Qb7
        • 2.Qxb7#
      • 1...Bxc8!
    • 1.c5?
      • threat
        • 2.Qxb6#
      • 1...Qa5+
        • 2.Qxa5#
      • 1...Qxc5+
        • 2.Sxc5#
      • 1...Qxb5+
        • 2.axb5#
      • 1...Qxc6
        • 2.Qa7#
      • 1...Qa7
        • 2.Qa5#
        • 2.Qxa7#
      • 1...Qb7
        • 2.Qa5#
        • 2.Qxb7#
      • 1...Qb8
        • 2.Qa5#
      • 1...Qxc7!
  • Keys
    • 1.a5!
      • threat
        • 2.Qxb6#
      • 1...Qxa5+
        • 2.Qxa5#
      • 1...Qc5+
        • 2.Sxc5#
      • 1...Qxb5+
        • 2.cxb5#
      • 1...Qxc7
        • 2.Sc5#
      • 1...Qxc6
        • 2.Qa7#
      • 1...Qg1
        • 2.Qb7#
      • 1...Qf2
        • 2.Qb7#
      • 1...Qe3
        • 2.Qb7#
      • 1...Qd4
        • 2.Qb7#
      • 1...Qa7
        • 2.Qxa7#
      • 1...Qb7
        • 2.Sc5#
        • 2.Qxb7#
      • 1...Qb8
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,N_PINS(E),OGATE::QAR1(G),XQ(b)
    • Q(b);CHECK,N_GUARD,N_PINS(E)::S(A),XQ(b)
    • Q(b);N_GUARD,N_PINS(E),XP(F)::QAR1(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB1(G),XQ(b)
      • Refutation
        • B(c);XQ(G)
    • Try
      • P(D);
      • Threat
        • QAR1(G),XQ(b)
      • Vars
        • Q(b);CHECK,N_PINS(E),OGATE::QAR1(G),XQ(b)
        • Q(b);CHECK,N_PINS(E),XP(D)::S(A),XQ(b)
        • Q(b);CHECK,OGATE,XS(E)::P(B),XQ(b)
        • Q(b);N_GUARD,N_PINS(E),XP(F)::QAR1(G)
        • Q(b);OGATE::QAR1(G)
      • Refutation
        • Q(b);N_PINS(E),XQ(G)
  • Actual
    • P(B);
    • Threat
      • QAR1(G),XQ(b)
    • Vars
      • Q(b);CHECK,N_PINS(E),OGATE,XP(B)::QAR1(G),XQ(b)
      • Q(b);CHECK,N_GUARD,N_PINS(E)::S(A),XQ(b)
      • Q(b);CHECK,OGATE,XS(E)::P(D),XQ(b)
      • Q(b);N_GUARD,N_PINS(E),XQ(G)::S(A)
      • Q(b);N_GUARD,N_PINS(E),XP(F)::QAR1(G)
      • Q(b);N_GUARD,N_PINS(E)::QAB1(G)
      • Q(b);N_GUARD,N_PINS(E),P_PINP(D)::QAB1(G)
      • Q(b);N_GUARD,N_PINS(E)::QAR1(G),XQ(b)
      • Q(b);N_GUARD::S(A)
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