MESON Chess Problem Database

Problem Display
PID: 205568 (8/6p1/8/8/5QPk/5K2/8/8 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

8/6p1/8/8/5QPk/5K2/8/8

#2

3 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qg3#
    • 1...g5
      • 2.Qh2#
      • 2.Qg3#
    • 1...g6
      • 2.Qh6#
  • Tries
    • 1.Kf2?
      • 1...Kh3
        • 2.Qg3#
      • 1...g5
        • 2.Qg3#
      • 1...g6!
    • 1.Kg2?
      • 1...g5
        • 2.Qg3#
      • 1...g6!
    • 1.Qd2?
      • 1...g6
        • 2.Qh6#
      • 1...g5
        • 2.Qh2#
      • 1...Kh3!
    • 1.Qe5?
      • threat
        • 2.Qh5#
      • 1...Kh3
        • 2.Qg3#
        • 2.Qh5#
      • 1...g5
        • 2.Qh2#
        • 2.Qg3#
        • 2.Qh8#
      • 1...g6!
    • 1.Qg5+?
      • 1...Kh3
        • 2.Qh5#
      • 1...Kxg5!
    • 1.Qf5?
      • threat
        • 2.Qh5#
      • 1...Kh3
        • 2.Qh7#
        • 2.Qh5#
      • 1...g5
        • 2.Qh7#
      • 1...g6!
    • 1.Qf8?
      • 1...Kh3
        • 2.Qh8#
      • 1...g6
        • 2.Qh6#
      • 1...g5
        • 2.Qh6#
        • 2.Qh8#
      • 1...Kg5!
    • 1.g5+?
      • 1...Kh3
        • 2.Qg3#
      • 1...Kh5!
  • Keys
    • 1.Qc1!
      • 1...Kh3
        • 2.Qh1#
      • 1...g6
        • 2.Qh6#
      • 1...g5
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR1(B)
    • P(b);N_GUARD::QAR2(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • P(b);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Vars
        • P(b);N_GUARD::QAR2(B)
        • P(b);SBLOCK::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • P(b);SBLOCK::QAR(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Vars
        • K(a);P-FLIGHT::QAR(B)
        • P(b);OGATE::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • P(b);N_GUARD::QAR2(B)
      • P(b);SBLOCK::QAR(B)
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