MESON Chess Problem Database

Problem Display
PID: 11665 (b3n2K/q1Q2N1p/8/7r/1pBk1p2/4R3/1pR1Pp2/3n4 w - - 0 1)

Valve, Leo Erland

4th Prize, Stella Polaris, 1970

b3n2K/q1Q2N1p/8/7r/1pBk1p2/4R3/1pR1Pp2/3n4

#2

7 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1
      • 2.Qe5#
      • 2.Qxa7#
    • 1...Rh2
      • 2.Qe5#
      • 2.Qxa7#
    • 1...Rh3
      • 2.Qe5#
      • 2.Qxa7#
    • 1...Rh4
      • 2.Qe5#
      • 2.Qxa7#
    • 1...Re5
      • 2.Qxe5#
    • 1...Rh6
      • 2.Qe5#
    • 1...Bd5
      • 2.Qxa7#
  • Keys
    • 1.Bd5!
      • threat
        • 2.Rd3#
      • 1...Kxe3
        • 2.Qxa7#
      • 1...Kxd5
        • 2.Qc4#
      • 1...Rxd5
        • 2.Qxf4#
      • 1...Bxd5
        • 2.Qxa7#
      • 1...Sxe3
        • 2.Rd2#
      • 1...fxe3
        • 2.Qc4#
      • 1...Qa3
        • 2.Qc5#
      • 1...Qa6
        • 2.Qc5#
      • 1...Rh3
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 2
  • Sets
    • R(g);N_GUARD::QAB1(E),XR(g)
    • R(g);N_GUARD::QAB1(E)
    • B(j);S_CUTR(g)::QAB(E),XQ(h)
  • Actual
    • B(D);
    • Threat
      • R1(C)
    • Vars
      • K(e);S_FLIGHT,XR(C)::QAB(E),XQ(h)
      • K(e);P-FLIGHT,XB(D)::QAB1(E)
      • R(g);SBLOCK,XB(D)::QAR2(E),XP(f)
      • B(j);SBLOCK,XB(D)::QAB(E),XQ(h)
      • S(a);SBLOCK,XR(C)::R(A)
      • P(f);SBLOCK,XR(C)::QAR1(E)
      • Q(h);N_GUARD::QAB1(E)
      • R(g);N_GUARD::QAB1(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).