MESON Chess Problem Database

Problem Display
PID: 204543 (2B5/5N2/5p1q/1K1k1p2/3pN3/6p1/2P5/4Q3 w - - 0 1)

Neunivako, Pavel Efimovich

64 Shakhmatnoe obozrenie, 1925

2B5/5N2/5p1q/1K1k1p2/3pN3/6p1/2P5/4Q3

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Sxf6#
    • 1...Qd2
      • 2.Sxf6#
    • 1...Qe3
      • 2.Sxf6#
    • 1...Qf4
      • 2.Sxf6#
    • 1...Qf8
      • 2.Sxf6#
    • 1...Qh1
      • 2.Sxf6#
    • 1...Qh2
      • 2.Sxf6#
    • 1...Qh3
      • 2.Sxf6#
    • 1...Qh5
      • 2.Sxf6#
    • 1...Qh7
      • 2.Sxf6#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Be6#
        • 2.Bb7#
        • 2.Qe6#
      • 1...Qe3
        • 2.Bb7#
      • 1...d3!
    • 1.Seg5?
      • threat
        • 2.Be6#
        • 2.Bb7#
        • 2.Qe6#
      • 1...fxg5
        • 2.Qe5#
      • 1...d3!
    • 1.Qd1?
      • threat
        • 2.Sc3#
      • 1...fxe4
        • 2.c4#
      • 1...d3
        • 2.Qxd3#
      • 1...Qe3
        • 2.Sxf6#
      • 1...Qd2
        • 2.Sxf6#
      • 1...Kxe4!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Sc3#
      • 1...Kxe4
        • 2.Bb7#
      • 1...Qxd2
        • 2.Sxf6#
      • 1...fxe4
        • 2.c4#
      • 1...d3
        • 2.Qxd3#
      • 1...Qe3
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(f);N_GUARD::S(C),XP(e)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(3)
      • Vars
        • Q(f);::B(F)
      • Refutation
        • P(b);
    • Try
      • S(C);
      • Threat
        • DUALS(3)
      • Vars
        • P(e);N_GUARD,XS(C)::QAR1(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);P_PINP(b)
      • Threat
        • S(C)
      • Vars
        • P(d);SBLOCK,XS(C)::P(B)
        • P(b);OGATEB::QAR2(A),XP(b)
        • Q(f);N_GUARD::S(C),XP(e)
        • Q(f);N_GUARD,N_SPINP(b)::S(C),XP(e)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT,XS(C)
  • Actual
    • Q(A);P_PINP(b)
    • Threat
      • S(C)
    • Vars
      • K(c);N_SPINP(b),S_FLIGHT,XS(C)::B(F)
      • Q(f);N_GUARD,N_SPINP(b),XQ(A)::S(C),XP(e)
      • P(d);SBLOCK,XS(C)::P(B)
      • P(b);OGATEB::QAR2(A),XP(b)
      • Q(f);N_GUARD::S(C),XP(e)
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