MESON Chess Problem Database

Problem Display
PID: 184820 (4n3/3B4/1NR1rp2/2r1k1p1/2P5/4K3/8/4Q3 w - - 0 1)

Dobbs, Gilbert S

3rd Prize, St. Paul's Dispatch, 1908

4n3/3B4/1NR1rp2/2r1k1p1/2P5/4K3/8/4Q3

#2

6 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Qxa5#
    • 1...Rxc6
      • 2.Qg3#
    • 1...Rd6
      • 2.Qg3#
    • 1...Re7
      • 2.Qc3#
      • 2.Qg3#
      • 2.Qa1#
    • 1...Sd6
      • 2.Rxc5#
    • 1...f5
      • 2.Rxe6#
      • 2.Qc3#
      • 2.Qa1#
  • Tries
    • 1.Kd3+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Kf4!
    • 1.Kf3+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Kd4!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qe4#
      • 1...Kf5+
        • 2.Qe4#
      • 1...Rxc4
        • 2.Qd5#
      • 1...Rcxc6
        • 2.Qd5#
      • 1...Rexc6
        • 2.Qh2#
      • 1...Sd6
        • 2.Rxc5#
      • 1...f5
        • 2.Rxe6#
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(a);OGATEB::QAR(A),XR(a)
    • R(d);XR(E)::QAB(A)
    • R(d);::QAB(A)
    • S(f);SBLOCK::R(E),XR(a)
  • Tries
    • Try
      • K(B);CHECK,P-FLIGHT
      • Vars
        • K(b);P-FLIGHT,P_SPINR(d)::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • K(B);CHECK,P-FLIGHT
      • Vars
        • K(b);P-FLIGHT,P_SPINR(d)::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(b);CHECK,P-FLIGHT,P_SPINR(d)::QAB1(A)
      • R(a);N_GUARD,XP(C)::QAR1(A)
      • R(a);N_GUARD,XR(E)::QAR1(A)
      • R(d);XR(E)::QAB(A)
      • S(f);SBLOCK::R(E),XR(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).