MESON Chess Problem Database

Problem Display
PID: 103828 (2qr1B2/8/1Pp3R1/RNnkpBpK/Q1p5/3p1N2/1p6/3nr1b1 w - - 0 1)

Wirtanen, Erkki Aukusti

Lacny-50 JT, 1976

2qr1B2/8/1Pp3R1/RNnkpBpK/Q1p5/3p1N2/1p6/3nr1b1

#2

9 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Sc7#
    • 1...Qe6
      • 2.Sc7#
    • 1...Qc7
      • 2.Sxc7#
    • 1...Qa8
      • 2.Sc7#
    • 1...Rd6
      • 2.Rxd6#
    • 1...Re8
      • 2.Rd6#
    • 1...Rxf8
      • 2.Rd6#
    • 1...Sf2
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Se3
      • 2.Sc3#
    • 1...Sb3
      • 2.Sc3#
      • 2.Sc7#
    • 1...Sxa4
      • 2.Sc3#
      • 2.Sc7#
    • 1...Se4
      • 2.Sc3#
      • 2.Sc7#
    • 1...Sa6
      • 2.Sc3#
      • 2.Sc7#
    • 1...Se6
      • 2.Sc3#
      • 2.Sc7#
    • 1...Sb7
      • 2.Sc3#
      • 2.Sc7#
    • 1...Sd7
      • 2.Sc3#
      • 2.Sc7#
  • Tries
    • 1.Sa3?
      • threat
        • 2.Qxc4#
      • 1...Qa6
        • 2.Qxc6#
      • 1...Se3
        • 2.Rxc5#
      • 1...c3
        • 2.Qb3#
        • 2.Qc4#
      • 1...Re4!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qxc4#
      • 1...Rxd6
        • 2.Rxd6#
      • 1...Qa6
        • 2.Be6#
      • 1...Re4
        • 2.Bxe4#
      • 1...Se3
        • 2.Be4#
      • 1...c3
        • 2.Qb3#
        • 2.Qa2#
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(l);N_GUARD::S(D)
    • Q(l);N_GUARD::S(D),XQ(l)
    • R(m);N_GUARD::R1(H),XR(m)
    • R(m);N_GUARD::R1(H)
    • R(m);N_GUARD,XB(I)::R1(H)
    • S(a);N_GUARD::S(D)
    • S(a);N_GUARD::S(D),XS(a)
  • Tries
    • Try
      • S(D);P_PINS(g)
      • Threat
        • QAB1(B),XP(f)
      • Vars
        • Q(l);N_GUARD::QAB1(B),XP(k)
        • S(a);S_CUTB(c)::R1(C),XS(g)
      • Refutation
        • R(b);
  • Actual
    • S(D);P_PINS(g)
    • Threat
      • QAB1(B),XP(f)
    • Vars
      • R(m);OGATE,XS(D)::R1(H),XR(m)
      • Q(l);N_GUARD::B(E)
      • R(b);N_GUARD::B(E),XR(b)
      • S(a);S_CUTR(b)::B(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).