MESON Chess Problem Database

Problem Display
PID: 276628 (n1bK2B1/3p3Q/p1k1pP2/P6R/8/2B5/1R1P4/8 w - - 0 1)

Haring, Jacobus

Stella Polaris, 1970

n1bK2B1/3p3Q/p1k1pP2/P6R/8/2B5/1R1P4/8

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bb7
      • 2.Qxd7#
    • 1...Sb6
      • 2.Rxb6#
    • 1...Sc7
      • 2.Rb6#
  • Tries
    • 1.Rc5+?
      • 1...Kd6
        • 2.Qe7#
      • 1...Kxc5!
    • 1.Qd3?
      • 1...Sb6
        • 2.Rxb6#
      • 1...e5
        • 2.Qd5#
      • 1...Bb7
        • 2.Qxd7#
      • 1...Sc7
        • 2.Rb6#
      • 1...d6
        • 2.Qc4#
      • 1...d5!
    • 1.Qe4+?
      • 1...Kd6
        • 2.Bb4#
      • 1...d5!
  • Keys
    • 1.Qc2!
      • 1...Kd6
        • 2.Bb4#
      • 1...Sb6
        • 2.Rxb6#
      • 1...e5
        • 2.Bxe5#
      • 1...d5
        • 2.Be5#
      • 1...Bb7
        • 2.Bb4#
      • 1...Sc7
        • 2.Rb6#
      • 1...d6
        • 2.Bd4#
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(f);N_GUARD::QAB1(G),XP(d)
    • S(e);N_GUARD::R1(A),XS(e)
    • S(e);N_GUARD::R1(A)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(G)
      • Refutation
        • K(b);P-FLIGHT,XR(E)
    • Try
      • Q(G);
      • Vars
        • S(e);N_GUARD::R1(A),XS(e)
        • P(c);N_GUARD::QAB1(G)
        • B(f);N_GUARD::QAB1(G),XP(d)
        • S(e);N_GUARD::R1(A)
        • P(d);SBLOCK::QAR2(G)
      • Refutation
        • P(d);
    • Try
      • Q(G);CHECK
      • Vars
        • K(b);P-FLIGHT,S_CUTP(d)::B(C)
      • Refutation
        • P(d);P_SPINP(d)
  • Actual
    • Q(G);
    • Vars
      • K(b);N_GUARD,P-FLIGHT::B(C)
      • S(e);N_GUARD::R1(A),XS(e)
      • P(c);::QAR(G)+B(C),XP(c)
      • P(d);SBLOCK::QAR(G)+B(C)
      • B(f);SBLOCK::QAR(G)+B(C)
      • S(e);N_GUARD::R1(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).