MESON Chess Problem Database

Problem Display
PID: 262499 (1R4b1/8/qp1Q3K/5p2/p1kN4/8/N7/1B6 w - - 0 1)

Lochet, Jean

Europe Echecs, 1961

1R4b1/8/qp1Q3K/5p2/p1kN4/8/N7/1B6

#2

6 + 6

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc8
      • 2.Rxc8#
    • 1...Bd5
      • 2.Qb4#
  • Tries
    • 1.Se6?
      • threat
        • 2.Qd3#
      • 1...Kb3
        • 2.Qb4#
      • 1...Kb5
        • 2.Qc5#
        • 2.Qd5#
      • 1...Bxe6!
    • 1.Qc7+?
      • 1...Kd5
        • 2.Rd8#
      • 1...Kxd4!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Qd3#
      • 1...Kxb3
        • 2.Qb4#
      • 1...Kb5
        • 2.Qc5#
      • 1...axb3
        • 2.Bd3#
      • 1...Bd5
        • 2.Qb4#
      • 1...b5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(d);N_GUARD::R(F),XQ(d)
    • B(f);SBLOCK::QAR1(D)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAB1(D)
      • Vars
        • K(b);N_GUARD,P_SPINP(e),S_FLIGHT::QAR1(D)
      • Refutation
        • B(f);XS(C)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT::R(F)
      • Refutation
        • K(b);P-FLIGHT,XS(C)
  • Actual
    • S(C);
    • Threat
      • QAB1(D)
    • Vars
      • K(b);N_GUARD,P_SPINP(e),S_FLIGHT,XS(C)::QAR1(D)
      • K(b);N_GUARD,P_SPINP(e),S_FLIGHT::QAR1(D)
      • P(a);SBLOCK,XS(C)::B(A)
      • B(f);SBLOCK::QAR1(D)
      • P(e);P_PINQ(D)::S(C)
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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).