MESON Chess Problem Database

Problem Display
PID: 207036 (3NB3/1q6/3k4/Q2N2RK/2nr4/8/8/8 w - - 0 1)

Gold, Samuel

Vasarnapi Ujsag, 1862

3NB3/1q6/3k4/Q2N2RK/2nr4/8/8/8

#2

6 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Qb4#
      • 2.Qc7#
    • 1...Qa8
      • 2.Qb4#
      • 2.Qc7#
    • 1...Qb1
      • 2.Qc7#
    • 1...Qb2
      • 2.Qc7#
    • 1...Qb3
      • 2.Qc7#
    • 1...Qb4
      • 2.Qxb4#
      • 2.Qc7#
    • 1...Qb5
      • 2.Qc7#
    • 1...Qc7
      • 2.Qxc7#
    • 1...Qd7
      • 2.Qb4#
    • 1...Qe7
      • 2.Qb4#
    • 1...Qg7
      • 2.Qb4#
  • Tries
    • 1.Qa3+?
      • 1...Qb4
        • 2.Qxb4#
      • 1...Sxa3!
  • Keys
    • 1.Qc5+!
      • 1...Kxc5
        • 2.Sxb7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(d);N_GUARD::QAB1(A)
    • Q(d);N_GUARD::QAB1(A),XQ(d)
    • Q(d);N_GUARD::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(d);N_GUARD,P_SPINQ(d)::QAB(A),XQ(d)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(c);S_FLIGHT,XQ(A)::S(E),XQ(d)
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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).