MESON Chess Problem Database

Problem Display
PID: 227539 (4q3/b1R4b/2PP4/1p1k2N1/2N5/PBQpP3/K3P3/8 w - - 0 1)

Isaev, Leonid Antonovich

4th Prize, El Ajedrez Argentino, 1926

4q3/b1R4b/2PP4/1p1k2N1/2N5/PBQpP3/K3P3/8

#2

11 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qd4#
    • 1...Qh5
      • 2.Qe5#
    • 1...Qxc6
      • 2.Qe5#
    • 1...Qg6
      • 2.Qe5#
    • 1...Qd7
      • 2.Qe5#
    • 1...Qf7
      • 2.Qe5#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qa8
      • 2.Qe5#
    • 1...Qb8
      • 2.Qe5#
    • 1...Qc8
      • 2.Qe5#
    • 1...Qd8
      • 2.Qe5#
    • 1...Qf8
      • 2.Qe5#
    • 1...Qg8
      • 2.Qe5#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bb8
      • 2.Qd4#
  • Tries
    • 1.Qxd3+?
      • 1...Kc5
        • 2.Qd4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bxd3!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Sd2#
      • 1...Ke4
        • 2.Qxd3#
      • 1...Kc5
        • 2.Qd4#
      • 1...Ke6
        • 2.Qe5#
      • 1...Qxc6
        • 2.Qe5#
      • 1...Qxf7
        • 2.Qe5#
      • 1...bxc4
        • 2.Qxc4#
      • 1...Qe4
        • 2.Sb6#
      • 1...d2
        • 2.Sxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 12
  • Sets
    • K(c);P-FLIGHT::QAB1(E)
    • Q(f);N_GUARD::QAR1(E)
    • Q(f);N_GUARD,XP(I)::QAR1(E)
    • Q(f);N_GUARD::QAR1(E),XQ(f)
    • B(d);N_GUARD::QAR1(E),XB(d)
    • B(d);N_GUARD::QAR1(E)
  • Tries
    • Try
      • Q(E);CHECK,XP(a)
      • Vars
        • K(c);P-FLIGHT::QAB1(E)
        • B(d);N_GUARD,P_SPINB(d)::QAR1(E),XB(d)
      • Refutation
        • B(e);XQ(E)
  • Actual
    • S(H);
    • Threat
      • B(D)+S(G)
    • Vars
      • K(c);S_FLIGHT::QAB1(E),XP(a)
      • K(c);P-FLIGHT::QAB1(E)
      • K(c);S_FLIGHT::QAR1(E)
      • Q(f);N_GUARD,XP(I)::QAR1(E)
      • Q(f);N_GUARD,XS(H)::QAR1(E)
      • P(b);OGATE,P_SPINP(b),XS(G)::QAB1(E),XP(b)
      • Q(f);SBLOCK::B(D)+S(G),DCHECK
      • P(a);::B(D)+S(G),XP(a)
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