MESON Chess Problem Database

Problem Display
PID: 122444 (8/4Q3/3p2p1/3p4/8/r2kB3/N2N1K2/4n3 w - - 0 1)

Wurzburg, Otto

Orillia Packet, 1898

8/4Q3/3p2p1/3p4/8/r2kB3/N2N1K2/4n3

#2

5 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Sb4#
    • 1...d4
      • 2.Qe4#
    • 1...g5
      • 2.Qh7#
  • Tries
    • 1.Qc7?
      • threat
        • 2.Sc1#
        • 2.Sb4#
      • 1...Rc3
        • 2.Sb4#
        • 2.Qxc3#
      • 1...Rb3
        • 2.Sc1#
      • 1...Ra4
        • 2.Sc1#
        • 2.Qc3#
      • 1...Sc2
        • 2.Sc1#
      • 1...Rxa2!
  • Keys
    • 1.Qb7!
      • 1...Kc2
        • 2.Qb1#
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Ra5
        • 2.Qb3#
      • 1...Ra6
        • 2.Qb3#
      • 1...Ra7
        • 2.Qb3#
      • 1...Ra8
        • 2.Qb3#
      • 1...Sc2
        • 2.Qb5#
      • 1...Sg2
        • 2.Qb1#
      • 1...Sf3
        • 2.Qb1#
      • 1...d4
        • 2.Qe4#
      • 1...g5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK::S(A)
    • P(d);N_GUARD::QAB1(E)
    • P(f);OGATEB::QAB(E)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::S(A)
        • S(a);::S(A)
      • Refutation
        • R(b);P_PINS(B),XS(A)
  • Actual
    • Q(E);
    • Vars
      • K(c);S_FLIGHT::QAB1(E)
      • R(b);N_GUARD,P_PINS(B),XS(A)::QAR2(E)
      • R(b);N_GUARD::QAR2(E),XR(b)
      • R(b);SBLOCK::S(A)
      • R(b);N_GUARD::QAR2(E)
      • S(a);SBLOCK::QAB(E)
      • S(a);N_GUARD::QAB(E)
      • P(d);OGATE::QAB1(E)
      • P(f);OGATEB::QAB(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).