MESON Chess Problem Database

Problem Display
PID: 172265 (5N2/3Q2Pq/7k/8/5p1K/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kubanski novosti, 1996

5N2/3Q2Pq/7k/8/5p1K/8/8/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.g8S#
    • 1...Qc2
      • 2.g8S#
    • 1...Qd3
      • 2.g8S#
    • 1...Qe4
      • 2.g8S#
    • 1...Qf5
      • 2.g8S#
    • 1...Qh8
      • 2.gxh8Q#
      • 2.gxh8R#
  • Tries
    • 1.Qc6+?
      • 1...Qg6
        • 2.Qxg6#
      • 1...Kxg7+!
    • 1.Qe6+?
      • 1...Qg6
        • 2.Qxg6#
      • 1...Kxg7+!
    • 1.Qd6+?
      • 1...Qg6
        • 2.Qxg6#
      • 1...Kxg7+!
    • 1.Qf7?
      • 1...Qxg7
        • 2.Qh5#
      • 1...Qg6
        • 2.Qxg6#
      • 1...Qb1
        • 2.g8S#
      • 1...Qc2
        • 2.g8S#
      • 1...Qd3
        • 2.g8S#
      • 1...Qe4
        • 2.g8S#
      • 1...Qf5
        • 2.g8S#
      • 1...Qg8
        • 2.Qg6#
        • 2.Qf6#
      • 1...Qh8
        • 2.Qg6#
        • 2.Qf6#
        • 2.gxh8Q#
        • 2.gxh8R#
      • 1...f3!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qg5#
      • 1...Qxg7
        • 2.Qh5#
      • 1...Qg6
        • 2.Qxg6#
      • 1...Qf5
        • 2.g8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD::P=S
    • Q(c);OGATE::PXQ(c)=Q
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAR1(B),XQ(c)
      • Refutation
        • K(b);CHECK,S_FLIGHT,XP(C)
    • Try
      • Q(B);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAR1(B),XQ(c)
      • Refutation
        • K(b);CHECK,S_FLIGHT,XP(C)
    • Try
      • Q(B);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAR1(B),XQ(c)
      • Refutation
        • K(b);CHECK,S_FLIGHT,XP(C)
    • Try
      • Q(B);
      • Vars
        • Q(c);SBLOCK,XP(C)::QAR1(B)
        • Q(c);N_GUARD::QAR1(B),XQ(c)
        • Q(c);N_GUARD::P=S
      • Refutation
        • P(a);
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • Q(c);SBLOCK,XP(C)::QAR1(B)
      • Q(c);N_GUARD::QAR1(B),XQ(c)
      • Q(c);N_GUARD::P=S
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