MESON Chess Problem Database

Problem Display
PID: 119773 (2n2K2/8/5p2/3pkB2/5p1N/Q7/2NP2P1/3q4 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Shakhmaty, 1925

2n2K2/8/5p2/3pkB2/5p1N/Q7/2NP2P1/3q4

#2

7 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.d4#
    • 1...Qf3
      • 2.d4#
    • 1...Qg4
      • 2.d4#
    • 1...Qh5
      • 2.d4#
    • 1...Qb1
      • 2.d4#
    • 1...Qc1
      • 2.d4#
    • 1...Qe1
      • 2.d4#
    • 1...Qf1
      • 2.d4#
    • 1...Qh1
      • 2.d4#
    • 1...Sb6
      • 2.Qe7#
    • 1...Sa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...d4
      • 2.Qc5#
  • Tries
    • 1.Qb2+?
      • 1...d4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Qc3+?
      • 1...d4
        • 2.Qxd4#
        • 2.Qc5#
      • 1...Kd6!
  • Keys
    • 1.g4!
      • threat
        • 2.Sg6#
      • 1...Qxc2
        • 2.Sf3#
      • 1...Qxg4
        • 2.d4#
      • 1...fxg4 ep
        • 2.Qxg3#
      • 1...d4
        • 2.Qc5#
      • 1...Se7
        • 2.Qxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(a);N_GUARD::P(B)
    • S(f);N_GUARD::QAR2(D)
    • S(f);N_GUARD::QAR2(D),XS(f)
    • P(c);OGATEB::QAR2(D)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(D),XP(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • P(C);
    • Threat
      • S(E)
    • Vars
      • Q(a);N_GUARD,XS(A)::S(E)
      • Q(a);N_GUARD,XP(C)::P(B)
      • P(b);EP,OGATEB,XP(C)::QAB(D),XP(b)
      • P(c);OGATEB::QAR2(D)
      • S(f);N_GUARD::QAR2(D),XS(f)
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