MESON Chess Problem Database

Problem Display
PID: 229185 (8/2BK4/5p2/r2k4/p1R2Q2/3r4/N7/4b2b w - - 0 1)

Pikler, Robert

Nepszava, 1926

8/2BK4/5p2/r2k4/p1R2Q2/3r4/N7/4b2b

#2

5 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd2
      • 2.Sc3#
      • 2.Sb4#
    • 1...Ra3
      • 2.Qd4#
    • 1...Rb3
      • 2.Qd4#
    • 1...Rc3
      • 2.Sb4#
      • 2.Qd4#
    • 1...Re3
      • 2.Qd4#
    • 1...Rf3
      • 2.Qd4#
      • 2.Qe4#
    • 1...Rg3
      • 2.Qd4#
    • 1...Rh3
      • 2.Qd4#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Bf2
      • 2.Sb4#
    • 1...Bg3
      • 2.Sb4#
    • 1...Bb4
      • 2.Sxb4#
    • 1...Bh4
      • 2.Sb4#
    • 1...Be4
      • 2.Qxe4#
  • Tries
    • 1.Sc3+?
      • 1...Rxc3
        • 2.Qd4#
      • 1...Bxc3!
    • 1.Qg4?
      • threat
        • 2.Qe6#
        • 2.Qg8#
      • 1...Rd4
        • 2.Qe6#
        • 2.Qxd4#
      • 1...Re3
        • 2.Qd4#
      • 1...Rg3
        • 2.Qe6#
        • 2.Qd4#
      • 1...Ra8
        • 2.Qe6#
      • 1...f5
        • 2.Qg8#
      • 1...Ra6!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Qc4#
      • 1...Be4
        • 2.Qd6#
      • 1...Rc3
        • 2.Sb4#
      • 1...Rd4
        • 2.Qf5#
      • 1...Rc5
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • R(c);N_GUARD::QAR1(C)
    • R(c);N_GUARD::QAR1(C),XR(c)
    • B(a);N_GUARD::S(A)
    • B(a);N_GUARD::S(A),XB(a)
    • B(b);N_GUARD::QAB1(C),XB(b)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • R(c);XS(A)::QAR1(C)
      • Refutation
        • B(a);XS(A)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD::QAR1(C)
        • R(e);::QAB1(C)
        • P(g);::QAB(C)
      • Refutation
        • R(e);
  • Actual
    • R(B);
    • Threat
      • QAB1(C)
    • Vars
      • B(b);SBLOCK::QAR1(C)
      • R(c);S_CUTB(a)::S(A)
      • R(c);SBLOCK::QAR2(C)
      • R(e);SBLOCK::R1(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).