MESON Chess Problem Database

Problem Display
PID: 218467 (4RK2/B7/B4N2/2r5/2nk4/n7/3p3p/5Q2 w - - 0 1)

Elson, Jacob

Philadelphia Times, 1882

4RK2/B7/B4N2/2r5/2nk4/n7/3p3p/5Q2

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qxc4#
    • 1...Sc2
      • 2.Qxc4#
    • 1...Se3
      • 2.Qd3#
      • 2.Qa1#
    • 1...Sa5
      • 2.Qd3#
      • 2.Qa1#
    • 1...Sb6
      • 2.Qd3#
    • 1...Sd6
      • 2.Qd3#
      • 2.Qa1#
  • Tries
    • 1.Qa1+?
      • 1...Sb2
        • 2.Qxb2#
      • 1...Kd3!
    • 1.Qf3?
      • threat
        • 2.Re4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sd6
        • 2.Qd3#
        • 2.Qe3#
      • 1...Se5!
  • Keys
    • 1.Re3!
      • threat
        • 2.Qd3#
        • 2.Qf4#
      • 1...Kxe3
        • 2.Bxc5#
      • 1...Sxe3
        • 2.Qa1#
      • 1...d1Q
        • 2.Qf4#
      • 1...d1R
        • 2.Qf4#
      • 1...h1Q
        • 2.Qd3#
      • 1...h1B
        • 2.Qd3#
      • 1...Sb2
        • 2.Qf4#
      • 1...Se5
        • 2.Qf4#
      • 1...Sd6
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::QAR1(A),XS(d)
    • S(d);N_SPINR(f)::QAR1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB(A),XS(d)
      • Refutation
        • K(e);N_SPINR(f),P-FLIGHT,P_SPINS(d)
    • Try
      • Q(A);
      • Threat
        • R1(E)
      • Vars
        • S(d);N_GUARD::QAB1(A),XS(d)
      • Refutation
        • S(d);
  • Actual
    • R(E);
    • Threat
      • DUALS(2)
    • Vars
      • K(e);S_FLIGHT,XR(E)::B(D),XR(f)
      • S(d);N_GUARD,SBLOCK,XR(E)::QAB(A)
      • P(a);::QAR2(A)
      • P(b);::QAR1(A)
      • S(d);::QAR2(A)
      • S(d);::QAR1(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).