MESON Chess Problem Database

Problem Display
PID: 167242 (4N3/kp6/p7/8/2P2B2/8/5PBK/7Q w - - 0 1)

Nikolichev, Aleksandr

Sachmatija, 2011

4N3/kp6/p7/8/2P2B2/8/5PBK/7Q

#2

7 + 3

5454 Near Snap 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qxb7#
      • 1...Ka8
        • 2.Qxb7#
      • 1...b6
        • 2.Qh7#
      • 1...b5!
    • 1.Qe1?
      • 1...Kb6
        • 2.Be3#
      • 1...a5
        • 2.Qxa5#
      • 1...b5
        • 2.Qe3#
      • 1...b6
        • 2.Qe7#
      • 1...Ka8!
  • Keys
    • 1.Qa1!
      • 1...Kb6
        • 2.Be3#
      • 1...Ka8
        • 2.Qxa6#
      • 1...a5
        • 2.Qxa5#
      • 1...b5
        • 2.Qd4#
      • 1...b6
        • 2.Qg7#

Anticipated by 80033(1961), 30238(1983)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(c)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::QAB1(A),XP(c)
        • P(c);OGATEB,SBLOCK::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Vars
        • K(b);S_FLIGHT::B(F)
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(c);N_GUARD::QAB(A)
        • P(c);OGATEB,SBLOCK::QAR(A)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(c)
  • Actual
    • Q(A);P_PINP(a)
    • Vars
      • K(b);N_SPINP(a),S_FLIGHT::B(F)
      • K(b);P-FLIGHT::QAR2(A),XP(a)
      • P(a);OGATEB::QAR2(A),XP(a)
      • P(c);N_GUARD::QAB(A)
      • P(c);OGATEB,SBLOCK::QAR(A)
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