MESON Chess Problem Database

Problem Display
PID: 223029 (8/1B2K1N1/1p2P3/q1p1k3/1Rp1rp1r/Q7/3P4/8 w - - 0 1)

Keeney, Ebenezer Wood

Ottawa Citizen, 1885

8/1B2K1N1/1p2P3/q1p1k3/1Rp1rp1r/Q7/3P4/8

#2

7 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc3#
    • 1...Re1
      • 2.Qc3#
    • 1...Re2
      • 2.Qc3#
    • 1...c3
      • 2.Rxe4#
  • Tries
    • 1.Qb2+?
      • 1...c3
        • 2.Rxe4#
      • 1...Rd4!
    • 1.Qf3?
      • threat
        • 2.Qxe4#
      • 1...Kd4
        • 2.Qxe4#
        • 2.Qc3#
      • 1...Re1
        • 2.Qd5#
        • 2.Qc3#
      • 1...Re2
        • 2.Qd5#
        • 2.Qc3#
      • 1...Re3
        • 2.Qd5#
      • 1...Rd4!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxe4#
        • 2.Qd5#
        • 2.Qd6#
      • 1...cxd3
        • 2.Rxe4#
      • 1...cxb4
        • 2.Qxe4#
        • 2.Qd6#
      • 1...f3
        • 2.Qd6#
      • 1...Rd4
        • 2.Qf5#
      • 1...Re1
        • 2.Qc3#
        • 2.Qd5#
        • 2.Qd6#
      • 1...Re2
        • 2.Qc3#
        • 2.Qd5#
        • 2.Qd6#
      • 1...Re3
        • 2.Qd5#
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • K(g);P_PINP(D),P_SPINP(a),S_FLIGHT::QAB1(B)
    • R(b);N_GUARD::QAB(B)
    • P(a);OGATE::R1(C),XR(b)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • P(a);OGATE,P_SPINP(a)::R1(C),XR(b)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XR(b)
      • Vars
        • R(b);OGATE::QAR1(B)
      • Refutation
        • R(b);
  • Actual
    • Q(B);
    • Threat
      • DUALS(3)
    • Vars
      • P(a);OGATE,XQ(B)::R1(C),XR(b)
      • P(c);::QAB1(B)
      • R(b);OGATE,SBLOCK::QAR1(B)
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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).