MESON Chess Problem Database

Problem Display
PID: 139221 (2rnR3/2pqP1K1/R1P1kp2/3nN3/6P1/Q7/B7/8 w - - 0 1)

Ellerman, Arnoldo

L'Echiquier, 1927

2rnR3/2pqP1K1/R1P1kp2/3nN3/6P1/Q7/B7/8

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc6
      • 2.exd8Q#
      • 2.exd8S#
      • 2.exd8B#
      • 2.exd8R#
    • 1...Qd6
      • 2.exd8S#
    • 1...Qxe7+
      • 2.Rxe7#
      • 2.Qxe7#
  • Tries
    • 1.Sf7?
      • threat
        • 2.Qe3#
        • 2.exd8S#
      • 1...Qxe8
        • 2.Qe3#
      • 1...Qxe7
        • 2.Rxe7#
        • 2.Qxe7#
        • 2.Qe3#
      • 1...Sxc6
        • 2.Qe3#
      • 1...Qd6
        • 2.exd8S#
      • 1...Sb7
        • 2.Qe3#
      • 1...Sxf7!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Sf7#
      • 1...Kd6
        • 2.Sc4#
      • 1...Qxc6
        • 2.exd8Q#
        • 2.exd8R#
      • 1...fxe5
        • 2.Qh6#
      • 1...Qd6
        • 2.exd8S#
      • 1...Sf7
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(e);N_PINP(G)::PXS(g)=S
  • Tries
    • Try
      • S(D);N_SPINP(G)
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);XR(I)::QAR(B)
        • S(g);XP(F)::QAR(B)
        • Q(e);N_GUARD::PXS(g)=S
        • S(g);::QAR(B)
      • Refutation
        • S(g);XS(D)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+S(D)
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::S(D)
      • Q(e);N_PINP(G),P_SPINQ(e),XP(F)::PXS(g)=Q
      • P(c);OGATEB,P_SPINP(c),SBLOCK,XS(D)::QAR(B)
      • Q(e);N_PINP(G),SBLOCK::PXS(g)=S
      • S(g);N_PINP(G)::QAR(B)+S(D),XS(g)
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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).