MESON Chess Problem Database

Problem Display
PID: 78391 (Q7/8/4p3/2pN4/2N1k1pP/2K5/b5P1/8 w - - 0 1)

Makaronets, Leonid

Australian Chess, 2004

Q7/8/4p3/2pN4/2N1k1pP/2K5/b5P1/8

#2

6 + 5

5454 Near Snap 2008
3713 Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...e5
      • 2.Sd6#
  • Tries
    • 1.Qe8?
      • threat
        • 2.Qxe6#
      • 1...Kxd5
        • 2.Qa8#
      • 1...e5
        • 2.Qxe5#
      • 1...Kf5!
    • 1.Qh8?
      • threat
        • 2.Qe5#
      • 1...Kxd5
        • 2.Qa8#
      • 1...Kf5
        • 2.Qh7#
      • 1...e5
        • 2.Qxe5#
      • 1...Bxc4!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Qxe6#
      • 1...Kxd5
        • 2.Qa8#
      • 1...Kf5
        • 2.Qh7#
      • 1...exd5
        • 2.Qxg4#
      • 1...e5
        • 2.Sd6#

Anticipated by 4590(1881), 9440(1889)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(e);SBLOCK::S(C)
  • Tries
    • Try
      • Q(F);P_PINP(e)
      • Threat
        • QAR2(F),XP(e)
      • Vars
        • K(b);N_SPINP(e),OGATEB,S_FLIGHT,XS(E)::QAB(F)
        • P(e);OGATE::QAR1(F),XP(e)
      • Refutation
        • K(b);N_SPINP(e),S_FLIGHT
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • K(b);OGATEB,S_FLIGHT,XS(E)::QAB(F)
        • K(b);S_FLIGHT::QAB(F)
        • P(e);::QAR1(F),XP(e)
      • Refutation
        • B(a);XS(C)
  • Actual
    • Q(F);
    • Threat
      • QAR2(F),XP(e)
    • Vars
      • K(b);OGATEB,P_SPINP(e),S_FLIGHT,XS(E)::QAB(F)
      • K(b);S_FLIGHT::QAB(F)
      • P(e);SBLOCK,XS(E)::QAR2(F),XP(c)
      • P(e);SBLOCK::S(C)
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