MESON Chess Problem Database

Problem Display
PID: 212081 (8/Qnr1BN1p/n3P3/2q3pK/6R1/3P4/b1N2kPP/5B1R w - - 0 1)

Petite, Efren

Schach-Echo, 1962

8/Qnr1BN1p/n3P3/2q3pK/6R1/3P4/b1N2kPP/5B1R

#2

12 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Qxe3#
    • 1...Qd4
      • 2.Qxd4#
  • Tries
    • 1.Bxg5?
      • threat
        • 2.Rf4#
      • 1...Bd5
        • 2.Bh4#
      • 1...Rxf7!
    • 1.Re4?
      • threat
        • 2.Re2#
      • 1...Qe3
        • 2.Qxe3#
      • 1...g4+!
  • Keys
    • 1.Sxg5!
      • threat
        • 2.Rf4#
      • 1...Bd5
        • 2.Sh3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE::QAB1(J),XQ(c)
    • Q(c);OGATE::QAB(J),XQ(c)
  • Tries
    • Try
      • B(K);P_SPINB(K),XP(d)
      • Threat
        • R(G)
      • Vars
        • B(a);N_PINB(K)::B(K)
      • Refutation
        • R(g);XS(L)
    • Try
      • R(G);
      • Threat
        • R1(G)
      • Vars
        • Q(c);OGATE::QAB1(J),XQ(c)
      • Refutation
        • P(d);CHECK
  • Actual
    • S(L);P_SPINS(L),XP(d)
    • Threat
      • R(G)
    • Vars
      • B(a);N_PINS(L)::S(L)
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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).