MESON Chess Problem Database

Problem Display
PID: 180415 (7N/8/8/5P1k/4Q3/KR4pq/4N2P/2B5 w - - 0 1)

Lider, Valentin Viktorovich

Schach-Aktiv, 1987

7N/8/8/5P1k/4Q3/KR4pq/4N2P/2B5

#2

8 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Sxg3#
    • 1...Qxf5
      • 2.Sxg3#
    • 1...gxh2
      • 2.Rxh3#
    • 1...g2
      • 2.Rxh3#
  • Tries
    • 1.Sg6?
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Qxh2
        • 2.Qf3#
      • 1...gxh2
        • 2.Rxh3#
      • 1...Qf1
        • 2.Sxg3#
        • 2.Qh4#
      • 1...Qg2
        • 2.Qh4#
      • 1...Qh4
        • 2.Qxh4#
      • 1...g2
        • 2.Rxh3#
      • 1...Qg4!
    • 1.Rxg3?
      • threat
        • 2.Rxh3#
      • 1...Qxg3+
        • 2.Sxg3#
      • 1...Qxh2
        • 2.Qg4#
      • 1...Qg4
        • 2.Qxg4#
      • 1...Qf1
        • 2.Qg4#
      • 1...Qg2
        • 2.Qg4#
      • 1...Qh4
        • 2.Qe8#
      • 1...Qxf5!
    • 1.Qf3+?
      • 1...Kh4
        • 2.Sg6#
      • 1...Qg4!
    • 1.Qf4?
      • threat
        • 2.Qg5#
      • 1...Qxf5
        • 2.Sxg3#
      • 1...Qg4
        • 2.Qh6#
      • 1...Qh4!
  • Keys
    • 1.f6!
      • 1...Qxh2
        • 2.Rb5#
      • 1...gxh2
        • 2.Rxh3#
      • 1...Qg4
        • 2.Qh7#
      • 1...Qf1
        • 2.Sxg3#
      • 1...Qg2
        • 2.Rb5#
      • 1...Qf5
        • 2.Sxg3#
      • 1...Qe6
        • 2.Sxg3#
      • 1...Qd7
        • 2.Sxg3#
      • 1...Qc8
        • 2.Sxg3#
      • 1...Qh4
        • 2.Qg6#
      • 1...g2
        • 2.Rxh3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD::S(B),XP(a)
    • Q(b);N_GUARD,XP(G)::S(B),XP(a)
    • P(a);OGATE,P_PINR(E),XP(C)::R(E),XQ(b)
    • P(a);OGATE,P_PINR(E)::R(E),XQ(b)
  • Tries
    • Try
      • S(H);
      • Vars
        • Q(b);OGATE,XP(G)::QAR2(F),XQ(b)
        • Q(b);N_GUARD,XP(C)::QAB(F)
        • P(a);OGATE,P_PINR(E),XP(C)::R(E),XQ(b)
        • Q(b);N_GUARD::QAR1(F)
        • Q(b);N_GUARD::QAR1(F),XQ(b)
        • P(a);OGATE,P_PINR(E)::R(E),XQ(b)
      • Refutation
        • Q(b);
    • Try
      • R(E);P_SPINR(E),XP(a)
      • Threat
        • R(E),XQ(b)
      • Vars
        • Q(b);CHECK,XR(E)::S(B),XQ(b)
        • Q(b);N_GUARD,N_PINR(E),XP(C)::QAB1(F)
        • Q(b);N_GUARD,N_PINR(E)::QAB1(F),XQ(b)
        • Q(b);N_GUARD,N_PINR(E)::QAB1(F)
        • Q(b);N_PINR(E),SBLOCK::QAB(F)
      • Refutation
        • Q(b);N_PINR(E),XP(G)
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);P-FLIGHT::S(H)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • Q(b);N_GUARD,XP(G)::S(B),XP(a)
        • Q(b);SBLOCK::QAR1(F)
      • Refutation
        • Q(b);
  • Actual
    • P(G);
    • Vars
      • Q(b);N_GUARD,XP(C)::R(E)
      • P(a);OGATE,P_PINR(E),XP(C)::R(E),XQ(b)
      • Q(b);SBLOCK::QAR2(F)
      • Q(b);N_GUARD::S(B),XP(a)
      • Q(b);N_GUARD::R(E)
      • Q(b);SBLOCK::QAB1(F)
      • P(a);OGATE,P_PINR(E)::R(E),XQ(b)
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