MESON Chess Problem Database

Problem Display
PID: 276629 (3K4/nB4Qn/2q3P1/1pB1P3/R1r1kNRN/6r1/2P2P2/8 w - - 0 1)

Hjelle, David

Stella Polaris, 1970

3K4/nB4Qn/2q3P1/1pB1P3/R1r1kNRN/6r1/2P2P2/8

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5+
      • 2.Bxd5#
    • 1...Rg1
      • 2.f3#
    • 1...Rg2
      • 2.f3#
    • 1...Rd3+
      • 2.cxd3#
    • 1...Rb4
      • 2.Rxb4#
    • 1...Rd4+
      • 2.Rxd4#
    • 1...Sc8
      • 2.Bxc6#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Qd7#
        • 2.Qf7#
        • 2.Qg8#
      • 1...Rxg4!
    • 1.Qf6?
      • threat
        • 2.Qf5#
      • 1...Qd5+
        • 2.Bxd5#
      • 1...Rd3+
        • 2.cxd3#
      • 1...Rd4+
        • 2.Rxd4#
      • 1...Sxf6!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qf5#
      • 1...Kxe5
        • 2.Qf5#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Rd3
        • 2.Sxd3#
      • 1...Rd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(e);CHECK,OGATE::B(J),XQ(e)
    • R(a);N_GUARD::P(B)
    • R(a);CHECK,OGATE::P(A),XR(a)
    • R(b);OGATEB::R(C),XR(b)
    • R(b);CHECK,OGATE::R1(C),XR(b)
    • S(f);N_GUARD::B(J),XQ(e)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • R(a);XR(E)
    • Try
      • Q(K);
      • Threat
        • QAB1(K)
      • Vars
        • Q(e);CHECK,OGATE::B(J),XQ(e)
        • R(a);CHECK,OGATE::P(A),XR(a)
        • R(b);CHECK,OGATE::R1(C),XR(b)
      • Refutation
        • S(g);XQ(K)
  • Actual
    • Q(K);
    • Threat
      • QAB1(K)
    • Vars
      • K(c);N_SPINQ(e),N_SPINR(b),P-FLIGHT,XP(H)::QAR1(K)
      • Q(e);N_GUARD,P_PINQ(K)::QAB1(K),XQ(e)
      • R(a);N_GUARD,P_PINQ(K)::R(E)+S(D),XR(a)
      • R(b);N_GUARD,P_PINQ(K)::QAR1(K),XR(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).