MESON Chess Problem Database

Problem Display
PID: 147739 (3R4/5rBB/q4P2/p1pN4/2rkP3/2N5/1n6/2R2Q1K w - - 0 1)

Isaev, Leonid Antonovich

Schackvarlden, 1930

3R4/5rBB/q4P2/p1pN4/2rkP3/2N5/1n6/2R2Q1K

#2

10 + 7

35 L'Italia Scacchistica 1930

SOLUTION

  • SOUND
  • Tries
    • 1.Se2+?
      • 1...Ke5
        • 2.Qf5#
      • 1...Kd3!
    • 1.Sb5+?
      • 1...Ke5
        • 2.Qf5#
      • 1...Qxb5!
    • 1.Sb6+?
      • 1...Ke3
        • 2.Bh6#
        • 2.Re1#
      • 1...Ke5
        • 2.Qf5#
      • 1...Rd7!
    • 1.Se7+?
      • 1...Ke3
        • 2.Sf5#
        • 2.Bh6#
        • 2.Re1#
      • 1...Ke5
        • 2.Qf5#
      • 1...Qd6!
    • 1.Qg1+?
      • 1...Kd3
        • 2.Sb4#
        • 2.Sf4#
        • 2.Qe3#
      • 1...Ke5!
    • 1.Qf2+?
      • 1...Kd3
        • 2.Sb4#
        • 2.Sf4#
        • 2.Qe3#
      • 1...Ke5!
  • Keys
    • 1.Qf4!
      • threat
        • 2.e5#
      • 1...Kd3
        • 2.Sb4#
        • 2.Qe3#
      • 1...Qxf6
        • 2.Se7#
      • 1...Rxf6
        • 2.Sb6#
      • 1...Sd3
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B)
      • Refutation
        • Q(f);XS(D)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B)
      • Refutation
        • Q(f);P_SPINQ(f)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+P(E)
    • Vars
      • Q(f);N_GUARD,P_SPINQ(f),XP(G)::R(J)+S(F)
      • R(g);N_GUARD,P_SPINR(g),XP(G)::R(J)+S(F)
      • S(a);SBLOCK::S(D)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).