MESON Chess Problem Database

Problem Display
PID: 228286 (8/4p3/3p1p1K/1N2p3/2B1kpQ1/4P3/8/8 w - - 0 1)

Neyndorff, Luke

US Problem Bulletin, 1986

8/4p3/3p1p1K/1N2p3/2B1kpQ1/4P3/8/8

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe3
      • 2.Qe2#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Qf3#
      • 1...exd4
        • 2.Qxf4#
      • 1...Kxe3!
    • 1.Qf3+?
      • 1...Kf5
        • 2.e4#
      • 1...Kxf3!
    • 1.Qh3?
      • threat
        • 2.Sc3#
      • 1...fxe3
        • 2.Qg4#
      • 1...f3!
    • 1.Qg2+?
      • 1...Kxe3
        • 2.Qe2#
      • 1...Kf5
        • 2.Qg6#
        • 2.e4#
      • 1...f3!
  • Keys
    • 1.Qe2!
      • 1...Kf5
        • 2.e4#
      • 1...fxe3
        • 2.Qg4#
      • 1...d5
        • 2.Bd3#
      • 1...f3
        • 2.Qd3#
      • 1...f5
        • 2.Sc3#
      • 1...e6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • K(a);N_SPINP(b),OGATEB,P-FLIGHT,XP(A)::QAR1(C)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAB1(C)
      • Vars
        • P(c);N_GUARD,XS(D)::QAR1(C),XP(b)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,XP(A)
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • K(a);OGATE,P_SPINP(b),S_FLIGHT::P(A)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • S(D)
      • Vars
        • P(b);OGATEB,SBLOCK,XP(A)::QAR2(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(A)::QAR1(C)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(C);N_PINP(b)
    • Vars
      • K(a);OGATE,S_FLIGHT::P(A)
      • P(b);OGATEB,P_SPINP(b),SBLOCK,XP(A)::QAR2(C)
      • P(d);SBLOCK::B(B)
      • P(b);SBLOCK::QAB1(C)
      • P(e);SBLOCK::S(D)
      • P(f);N_GUARD::S(D),XP(d)
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