MESON Chess Problem Database

Problem Display
PID: 120659 (4r3/4n2R/5k2/8/8/4Q3/2B5/2K5 w - - 0 1)

Lokker, Miklosh S

Boletim da UBP, 1968

4r3/4n2R/5k2/8/8/4Q3/2B5/2K5

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxe7#
    • 1...Rb8
      • 2.Qxe7#
    • 1...Rc8
      • 2.Qxe7#
    • 1...Rd8
      • 2.Qxe7#
    • 1...Rf8
      • 2.Qxe7#
    • 1...Rg8
      • 2.Qxe7#
    • 1...Rh8
      • 2.Qxe7#
  • Tries
    • 1.Qd4+?
      • 1...Kg5
        • 2.Qh4#
      • 1...Ke6!
    • 1.Qf4+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Ke6!
  • Keys
    • 1.Qe4!
      • 1...Kg5
        • 2.Qh4#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sd5
        • 2.Qf5#
      • 1...Ra8
        • 2.Qxe7#
      • 1...Rb8
        • 2.Qxe7#
      • 1...Rc8
        • 2.Qxe7#
      • 1...Rd8
        • 2.Qxe7#
      • 1...Rf8
        • 2.Qxe7#
      • 1...Rg8
        • 2.Qxe7#
      • 1...Rh8
        • 2.Qxe7#
      • 1...Sc6
        • 2.Qf5#
      • 1...Sg6
        • 2.Qf5#
      • 1...Sc8
        • 2.Qf5#
      • 1...Sg8
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAB1(C),XS(b)
    • R(c);N_GUARD,P_PINB(B)::QAB1(C),XS(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(C),XS(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • S(b);N_GUARD::QAR1(C),XS(b)
      • S(b);N_GUARD::QAR1(C)
      • R(c);N_GUARD::QAB1(C),XS(b)
      • R(c);N_GUARD,P_PINB(B)::QAB1(C),XS(b)
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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).