MESON Chess Problem Database

Problem Display
PID: 163968 (nKN5/8/k7/p7/8/3P4/8/Q7 w - - 0 1)

Pikhurov, Dimitry Egorovich

Sachmatija, 2006

nKN5/8/k7/p7/8/3P4/8/Q7

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Qxa4#
  • Tries
    • 1.Kxa8?
      • 1...a4
        • 2.Qxa4#
      • 1...Kb5!
    • 1.Qb2?
      • threat
        • 2.Qb7#
      • 1...Sb6
        • 2.Qxb6#
      • 1...a4!
    • 1.Qf6+?
      • 1...Sb6
        • 2.Qxb6#
      • 1...Kb5!
    • 1.Qb1?
      • threat
        • 2.Qb7#
      • 1...Sb6
        • 2.Qxb6#
      • 1...a4!
    • 1.Qa4?
      • threat
        • 2.Qc4#
      • 1...Sc7
        • 2.Qc6#
      • 1...Sb6!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qc4#
      • 1...Kb5
        • 2.Qc4#
      • 1...a4
        • 2.Qxa4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sc7
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAR2(A),XP(a)
  • Tries
    • Try
      • K(C);P-FLIGHT,XS(c)
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAB1(A)
      • Vars
        • S(c);N_GUARD::QAR1(A),XS(c)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(A),XS(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAB1(A)
      • Vars
        • S(c);N_GUARD::QAR1(A),XS(c)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(c);N_GUARD::QAR2(A)
      • Refutation
        • S(c);
  • Actual
    • Q(A);N_PINP(a)
    • Threat
      • QAB(A)
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • P(a);OGATEB::QAR2(A),XP(a)
      • S(c);N_GUARD::QAR1(A),XS(c)
      • S(c);N_GUARD::QAR1(A)
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