MESON Chess Problem Database

Problem Display
PID: 43963 (5B2/8/R1qp1k1N/3P1B2/1pP4P/2rN1R1K/8/Qb2n3 w - - 0 1)

Ramsey, Robert Henry

Lasker's Chess Magazine, 1904

5B2/8/R1qp1k1N/3P1B2/1pP4P/2rN1R1K/8/Qb2n3

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Rxd6#
    • 1...Qb5
      • 2.Rxd6#
    • 1...Qb7
      • 2.Rxd6#
    • 1...Qa8
      • 2.Rxd6#
    • 1...Qxc4
      • 2.Rxd6#
    • 1...Sc2
      • 2.Be4#
      • 2.Bh7#
    • 1...b3
      • 2.Qxc3#
  • Keys
    • 1.Se5!
      • threat
        • 2.Seg4#
        • 2.Shg4#
      • 1...Rxf3+
        • 2.Sxf3#
      • 1...Bxf5+
        • 2.Shg4#
      • 1...Kxe5
        • 2.Bg7#
      • 1...Qxc4
        • 2.Sd7#
      • 1...Rxc4
        • 2.Sxc4#
        • 2.Seg4#
        • 2.Sd7#
        • 2.Sg8#
      • 1...Sxf3
        • 2.Seg4#
      • 1...dxe5
        • 2.Rxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(e);OGATE,P_SPINP(f)::R(I),XP(f)
    • Q(e);OGATE,P_SPINP(f),XP(E)::R(I),XP(f)
    • P(d);N_GUARD::QAB(A),XR(c)
  • Actual
    • S(B);N_PINR(c),P_SPINR(C)
    • Threat
      • DUALS(2)
    • Vars
      • R(c);CHECK,XR(C)::QAB(A)+S(B),XR(c)
      • B(a);CHECK,P_SPINB(a),XB(H)::S(J)
      • K(g);P_SPINR(c),S_FLIGHT,XS(B)::B(K)
      • Q(e);N_GUARD,P_SPINP(f),XP(E)::S(B)
      • S(b);XR(C)::S(B)
      • P(f);OGATEB,P_SPINQ(e),SBLOCK,XS(B)::R(I),XQ(e)
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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).