MESON Chess Problem Database

Problem Display
PID: 227583 (3N2bq/8/8/3kpPQ1/2N5/3p4/B7/K5B1 w - - 0 1)

Levman, Semyon Semyonovich

L'Italia Scacchistica, 1926

3N2bq/8/8/3kpPQ1/2N5/3p4/B7/K5B1

#2

7 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Sd2#
    • 1...e4+
      • 2.f6#
  • Tries
    • 1.Sb2+?
      • 1...Ke4
        • 2.Qg4#
      • 1...Kd6!
    • 1.Sa3+?
      • 1...Ke4
        • 2.Qg4#
      • 1...Kd6!
    • 1.Sa5+?
      • 1...Ke4
        • 2.Qg4#
      • 1...Kd6!
    • 1.Sb6+?
      • 1...Ke4
        • 2.Qg4#
      • 1...Kd6!
    • 1.Qe3?
      • threat
        • 2.Qxd3#
      • 1...Qh3
        • 2.Qxe5#
      • 1...Qh4
        • 2.Qxe5#
      • 1...d2
        • 2.Qd3#
      • 1...e4+!
    • 1.Qe7?
      • threat
        • 2.Sd2#
        • 2.Sd6#
        • 2.Qb7#
      • 1...e4+
        • 2.Sb2#
        • 2.Se5#
      • 1...Qf6
        • 2.Sd2#
        • 2.Sd6#
      • 1...Qg7
        • 2.Sd2#
        • 2.Sd6#
      • 1...Qh2
        • 2.Sd2#
        • 2.Qb7#
      • 1...Qh4
        • 2.Qxe5#
        • 2.Qb7#
      • 1...Qh6
        • 2.Sd2#
        • 2.Sd6#
        • 2.Qxe5#
      • 1...Qh7
        • 2.Sd2#
        • 2.Sd6#
        • 2.Qxe5#
      • 1...d2
        • 2.Sxd2#
        • 2.Sd6#
        • 2.Qb7#
      • 1...Ke4!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qxd3#
      • 1...e4+
        • 2.Sb2#
      • 1...Ke4
        • 2.Sd6#
      • 1...Qh3
        • 2.Qxe5#
      • 1...Qh4
        • 2.Qxe5#
      • 1...d2
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::S(D)
    • P(c);CHECK,SBLOCK::QAR(F)+P(E)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(F)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(F)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(F)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(F)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(F);
      • Threat
        • QAR2(F),XP(a)
      • Vars
        • Q(e);N_GUARD::QAR1(F),XP(c)
        • P(a);::QAR2(F)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAR2(F),XP(a)
    • Vars
      • P(c);CHECK,SBLOCK::B(C)+S(D)
      • K(b);S_FLIGHT::S(D)
      • Q(e);N_GUARD::QAR1(F),XP(c)
      • P(a);::QAR2(F)
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