MESON Chess Problem Database

Problem Display
PID: 229788 (2B3nK/8/7N/3p3p/3Q2RN/ppr3Bk/rb6/8 w - - 0 1)

Nielsen, Kristian

Tidskrift for Schack, 1911

2B3nK/8/7N/3p3p/3Q2RN/ppr3Bk/rb6/8

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Rg5#
      • 2.Rg6#
      • 2.Rg7#
      • 2.Rxg8#
    • 1...hxg4
      • 2.Qxg4#
  • Tries
    • 1.Re4+?
      • 1...Kxg3
        • 2.Qg1#
      • 1...Rxc8!
    • 1.Rf4+?
      • 1...Kxg3
        • 2.Qf2#
      • 1...Rxc8!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Rc4#
        • 2.Qf1#
      • 1...Rc1+
        • 2.Be5#
      • 1...Rc2+
        • 2.Be5#
      • 1...Rxd3+
        • 2.Rg7#
      • 1...Rc4+
        • 2.Be5#
      • 1...Rc5+
        • 2.Be5#
      • 1...Rc6+
        • 2.Be5#
      • 1...Rc7+
        • 2.Be5#
      • 1...Rxc8+
        • 2.Be5#
      • 1...Sxh6
        • 2.Qf1#
      • 1...hxg4
        • 2.Bxg4#
      • 1...Ra1
        • 2.Rc4#
      • 1...Ba1
        • 2.Rc4#
      • 1...Bc1
        • 2.Rc4#
      • 1...Sf6
        • 2.Qf1#
      • 1...Se7
        • 2.Qf1#
      • 1...d4
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 15
    • REMOVED MATES = 0
  • Sets
    • P(h);OGATE,P_SPINP(h),XR(C)::QAB1(B),XP(h)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(f);P-FLIGHT,XB(A)::QAR2(B)
      • Refutation
        • R(e);P_PINQ(B),XB(F)
    • Try
      • R(C);CHECK
      • Vars
        • K(f);P-FLIGHT,XB(A)::QAB1(B)
      • Refutation
        • R(e);P_PINQ(B),XB(F)
  • Actual
    • Q(B);
    • Threat
      • DUALS(2)
    • Vars
      • R(e);CHECK,N_GUARD::QAR(B)+B(A)
      • R(e);CHECK,N_GUARD,XQ(B)::B(F)+R(C)
      • R(e);CHECK,N_GUARD,XB(F)::QAR(B)+B(A)
      • S(i);XS(E)::QAB(B)
      • P(h);OGATE,P_SPINP(h),XR(C)::B(F),XP(h)
      • R(a);::B(F)+R(C)
      • B(b);::B(F)+R(C)
      • S(i);::QAB(B)
      • P(g);::QAB(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).