MESON Chess Problem Database

Problem Display
PID: 240457 (8/8/ppn5/k7/8/Kp6/8/3Q4 w - - 0 1)

Parkhomenko, Nikolai A

Problemist Pribuzhya, 1992

8/8/ppn5/k7/8/Kp6/8/3Q4

#2

2 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kb5
      • 2.Qd5#
    • 1...b2
      • 2.Qa4#
  • Tries
    • 1.Qe1+?
      • 1...Sb4
        • 2.Qxb4#
      • 1...Kb5!
    • 1.Qd6?
      • 1...Kb5
        • 2.Qd5#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sd4
        • 2.Qb4#
      • 1...Se5
        • 2.Qb4#
      • 1...Sa7
        • 2.Qb4#
      • 1...Se7
        • 2.Qb4#
      • 1...Sb8
        • 2.Qb4#
      • 1...Sd8
        • 2.Qb4#
      • 1...b5
        • 2.Qc7#
      • 1...b2!
    • 1.Qd7?
      • 1...Kb5
        • 2.Qd5#
      • 1...Sb4
        • 2.Qa4#
      • 1...Sd4
        • 2.Qa4#
      • 1...Se5
        • 2.Qa4#
      • 1...Sa7
        • 2.Qa4#
      • 1...Se7
        • 2.Qa4#
      • 1...Sb8
        • 2.Qa4#
      • 1...Sd8
        • 2.Qa4#
      • 1...b5
        • 2.Qc7#
      • 1...b2!
  • Keys
    • 1.Qd2+!
      • 1...Kb5
        • 2.Qd5#
      • 1...Sb4
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(b);P-FLIGHT::QAR2(A)
    • P(a);OGATE::QAR1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAB1(A),XS(e)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • S(e);N_GUARD::QAB1(A),XS(e)
        • S(e);N_GUARD::QAB1(A)
        • P(d);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • K(b);P-FLIGHT,P_SPINS(e)::QAR2(A)
        • S(e);OGATE::QAR1(A)
        • P(d);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • P(a);
  • Actual
    • Q(A);CHECK
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • S(e);N_GUARD,P_SPINS(e)::QAB1(A),XS(e)
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