MESON Chess Problem Database

Problem Display
PID: 124322 (B7/1q3R1K/5pQB/b7/rr6/5kp1/2R4P/8 w - - 0 1)

Legentil, Georges

Le Probleme, 1949

B7/1q3R1K/5pQB/b7/rr6/5kp1/2R4P/8

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Rxf6#
      • 2.Qf5#
    • 1...Re4
      • 2.Qxg3#
    • 1...Rg4
      • 2.Qd3#
    • 1...gxh2
      • 2.Qg2#
    • 1...g2
      • 2.Qxg2#
  • Tries
    • 1.Bxb7+?
      • 1...Re4
        • 2.Rxf6#
        • 2.Qf5#
        • 2.Qh5#
        • 2.Qxg3#
      • 1...Rxb7!
  • Keys
    • 1.Re7!
      • threat
        • 2.Qxg3#
      • 1...gxh2
        • 2.Qg2#
      • 1...Qe4
        • 2.Qf5#
      • 1...Rg4
        • 2.Qd3#
      • 1...Bc7
        • 2.Re3#
      • 1...g2
        • 2.Qxg2#
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(d);N_SPINQ(g),SBLOCK::QAR1(C),XP(b)
    • R(d);SBLOCK::QAR2(C)
    • P(b);OGATE,XP(B)::QAB1(C)
    • P(b);OGATE::QAB1(C),XP(b)
  • Tries
    • Try
      • B(G);CHECK,N_SPINR(E),XQ(g)
      • Refutation
        • R(d);P_PINR(E),XB(G)
  • Actual
    • R(E);N_PINP(f)
    • Threat
      • QAR1(C),XP(b)
    • Vars
      • P(b);OGATE,XP(B)::QAB1(C)
      • Q(g);N_PINR(E),P_PINQ(C),S_CUTR(d)::QAR2(C)
      • R(d);SBLOCK::QAR2(C)
      • B(e);N_PINR(E)::R1(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).