MESON Chess Problem Database

Problem Display
PID: 206801 (1r6/8/8/3q4/Q7/2K5/7R/1k6 w - - 0 1)

Courtenay, Edward H

Dubuque Chess Journal, 1870

1r6/8/8/3q4/Q7/2K5/7R/1k6

#2

3 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc1
      • 2.Qc2#
    • 1...Qh1
      • 2.Rxh1#
    • 1...Qa2
      • 2.Rh1#
      • 2.Qd1#
    • 1...Qe4
      • 2.Qd1#
    • 1...Qe6
      • 2.Qd1#
    • 1...Qb7
      • 2.Qd1#
    • 1...Qf7
      • 2.Qd1#
    • 1...Qa8
      • 2.Qd1#
    • 1...Qg8
      • 2.Qd1#
    • 1...Qd1
      • 2.Qxd1#
    • 1...Qb5
      • 2.Qd1#
    • 1...Qf5
      • 2.Qd1#
  • Tries
    • 1.Rh1+?
      • 1...Qd1
        • 2.Rxd1#
      • 1...Qxh1!
    • 1.Rb2+?
      • 1...Kc1
        • 2.Qc2#
        • 2.Qa1#
      • 1...Rxb2!
  • Keys
    • 1.Qa2+!
      • 1...Kc1
        • 2.Qc2#
      • 1...Qxa2
        • 2.Rh1#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • K(a);P-FLIGHT::QAR1(C)
    • Q(b);N_GUARD::R(A),XQ(b)
    • Q(b);N_GUARD::QAR2(C)
    • Q(b);N_GUARD::QAR2(C),XQ(b)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::R(A),XQ(b)
      • Refutation
        • Q(b);XR(A)
    • Try
      • R(A);CHECK
      • Refutation
        • R(c);XR(A)
  • Actual
    • Q(C);CHECK
    • Vars
      • K(a);P-FLIGHT::QAR1(C)
      • Q(b);SBLOCK,XQ(C)::R(A)
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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).