MESON Chess Problem Database

Problem Display
PID: 108817 (3K4/1Q6/3p4/Rn1B1n1R/3kPr2/P2p4/3B1P2/1r6 w - - 0 1)

Lazdinits, Eriks

Latvian Championship, 1959

3K4/1Q6/3p4/Rn1B1n1R/3kPr2/P2p4/3B1P2/1r6

#2

9 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qa7#
    • 1...Ke5
      • 2.Qg7#
    • 1...Se3
      • 2.Qb6#
    • 1...Sg3
      • 2.Qb6#
    • 1...Sh4
      • 2.Qb6#
    • 1...Sh6
      • 2.Qb6#
    • 1...Se7
      • 2.Qb6#
    • 1...Sg7
      • 2.Qb6#
  • Tries
    • 1.Ra4+?
      • 1...Kc5
        • 2.Rc4#
        • 2.Qc6#
      • 1...Ke5
        • 2.Qe7#
        • 2.Qg7#
      • 1...Rb4!
    • 1.Qa7+?
      • 1...Ke5
        • 2.Qg7#
      • 1...Sxa7!
    • 1.Qg7+?
      • 1...Kc5
        • 2.Qa7#
      • 1...Sxg7!
  • Keys
    • 1.Bb3!
      • threat
        • 2.Qd5#
      • 1...Kc5
        • 2.Be3#
      • 1...Ke5
        • 2.Bc3#
      • 1...d5
        • 2.Qxd5#
      • 1...Sc3
        • 2.Qb4#
      • 1...Sc7
        • 2.Qb4#
      • 1...Se3
        • 2.fxe3#
      • 1...Se7
        • 2.Ra4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • K(c);P_SPINS(e),S_FLIGHT::QAB(H)
    • K(c);P_SPINS(f),S_FLIGHT::QAB(H)
    • S(f);::QAB(H)
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(H);CHECK
      • Vars
        • K(c);P_SPINS(f),S_FLIGHT::QAB(H)
      • Refutation
        • S(e);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • K(c);P_SPINS(e),S_FLIGHT::QAB(H)
      • Refutation
        • S(f);XQ(H)
  • Actual
    • B(F);
    • Threat
      • QAR1(H)
    • Vars
      • K(c);P_SPINS(e),S_FLIGHT::B(A)
      • P(g);::QAR1(H),XP(g)
      • S(e);OGATE::QAR2(H)
      • S(f);OGATE::P(B),XS(f)
      • S(f);::R(E)
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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).