MESON Chess Problem Database

Problem Display
PID: 204268 (qN6/kpQp4/8/1K6/8/8/8/8 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

qN6/kpQp4/8/1K6/8/8/8/8

#2

3 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb8
      • 2.Qa5#
    • 1...d5
      • 2.Sc6#
    • 1...d6
      • 2.Sc6#
  • Tries
    • 1.Ka5?
      • 1...d6
        • 2.Sc6#
      • 1...d5
        • 2.Sc6#
      • 1...Qxb8!
    • 1.Sxd7?
      • threat
        • 2.Qa5#
        • 2.Qb6#
      • 1...Qb8
        • 2.Qa5#
        • 2.Qxb8#
      • 1...Qc8
        • 2.Qa5#
      • 1...Qe8
        • 2.Qa5#
      • 1...Qf8
        • 2.Qa5#
      • 1...Qg8
        • 2.Qa5#
      • 1...Qh8
        • 2.Qa5#
      • 1...Qd8!
    • 1.Qc5+?
      • 1...b6
        • 2.Qxb6#
      • 1...Kxb8!
  • Keys
    • 1.Qd6!
      • 1...Qxb8
        • 2.Qa3#
      • 1...b6
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(d);SBLOCK,XS(C)::QAR2(B)
    • P(c);N_GUARD::S(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(c);N_GUARD::S(C)
      • Refutation
        • Q(d);XS(C)
    • Try
      • S(C);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(d);::QAR2(B)
        • Q(d);P_PINS(C)::QAR2(B)
      • Refutation
        • Q(d);
    • Try
      • Q(B);CHECK,N_PINP(b)
      • Vars
        • P(b);P_SPINP(b)::QAB1(B),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
  • Actual
    • Q(B);N_PINP(b)
    • Vars
      • Q(d);SBLOCK,XS(C)::QAR(B)
      • P(b);::QAB1(B),XP(b)
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