MESON Chess Problem Database

Problem Display
PID: 96689 (B7/5r1n/1p5N/3RP1Bb/R1P1k3/bK6/2Pr1PP1/2N4Q w - - 0 1)

Santiago, Joao Baptista

Problem (Zagreb), 1954

B7/5r1n/1p5N/3RP1Bb/R1P1k3/bK6/2Pr1PP1/2N4Q

#2

13 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3+
      • 2.cxd3#
    • 1...Ra7
      • 2.g4#
    • 1...Rb7
      • 2.g4#
    • 1...Rc7
      • 2.g4#
    • 1...Rd7
      • 2.g4#
    • 1...Re7
      • 2.g4#
    • 1...Rg7
      • 2.g4#
    • 1...Sf6
      • 2.g4#
  • Tries
    • 1.Qh4+?
      • 1...Rf4
        • 2.Qxf4#
      • 1...Bg4!
    • 1.c5+?
      • 1...Rd4
        • 2.Raxd4#
      • 1...Bb4!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Rd7#
      • 1...Rxd3+
        • 2.cxd3#
      • 1...Rf6
        • 2.Rd6#
      • 1...Ra7
        • 2.g4#
      • 1...Rb7
        • 2.g4#
      • 1...Rc7
        • 2.g4#
      • 1...Rd7
        • 2.Rxd7#
        • 2.g4#
      • 1...Rf8
        • 2.Rd8#
      • 1...Bd6
        • 2.c5#
      • 1...Sf6
        • 2.g4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(a);CHECK,OGATE::P(C),XR(a)
    • R(f);N_GUARD::QAB(B)+P(E)
    • S(g);S_CUTR(f)::QAB(B)+P(E)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAR1(B),XR(f)
      • Refutation
        • B(d);P_SPINB(d)
    • Try
      • P(H);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::R1(G),XR(a)
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • S(A);
    • Threat
      • B(M)+R(I)
    • Vars
      • R(a);CHECK,OGATE,XS(A)::P(C),XR(a)
      • R(f);N_GUARD::B(M)+R(I)
      • R(f);N_GUARD::QAB(B)+P(E)
      • B(b);N_GUARD::R(G)+P(H)
      • S(g);S_CUTR(f)::QAB(B)+P(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).