MESON Chess Problem Database

Problem Display
PID: 246619 (8/N7/8/p7/1PQB4/k6K/8/8 w - - 0 1)

Chistyakov, Nikolay

Magadanskaya Pravda, 1998

8/N7/8/p7/1PQB4/k6K/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Sb5#
  • Tries
    • 1.Bb2+?
      • 1...Ka4
        • 2.b5#
      • 1...Kxb2!
    • 1.Bc3?
      • 1...Ka4
        • 2.Qa2#
      • 1...a4
        • 2.Sb5#
      • 1...axb4!
    • 1.Qc3+?
      • 1...Ka2
        • 2.Qb2#
      • 1...Ka4!
  • Keys
    • 1.Qc2!
      • 1...Kxb4
        • 2.Bc5#
      • 1...axb4
        • 2.Sb5#
      • 1...a4
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::S(E)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(C)+P(B)
      • Refutation
        • K(a);S_FLIGHT,XB(D)
    • Try
      • B(D);
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);SBLOCK::S(E)
      • Refutation
        • P(b);XP(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);OGATEB,S_FLIGHT,XP(B)::B(D)
      • P(b);SBLOCK,XP(B)::S(E)
      • P(b);SBLOCK::QAB1(C)
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