MESON Chess Problem Database

Problem Display
PID: 261351 (B3N2K/2p5/5R1p/4k2N/1R2p3/p2br3/3Q4/q5b1 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Neue Zurcher Zeitung, 1989

B3N2K/2p5/5R1p/4k2N/1R2p3/p2br3/3Q4/q5b1

#2

7 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.Qxc3#
    • 1...Qb1
      • 2.Qc3#
    • 1...Qd1
      • 2.Qc3#
    • 1...Qf1
      • 2.Qc3#
    • 1...Qa2
      • 2.Qc3#
    • 1...Re1
      • 2.Qf4#
    • 1...Re2
      • 2.Qf4#
    • 1...Rg3
      • 2.Qf4#
    • 1...Rh3
      • 2.Qf4#
    • 1...Bb1
      • 2.Qd5#
    • 1...Bf1
      • 2.Qd5#
    • 1...Bc2
      • 2.Qd5#
    • 1...Be2
      • 2.Qd5#
    • 1...Bb5
      • 2.Qd5#
    • 1...Ba6
      • 2.Qd5#
  • Tries
    • 1.Seg7?
      • threat
        • 2.Re6#
      • 1...Qa2
        • 2.Qc3#
      • 1...Bc4
        • 2.Rf5#
      • 1...c6!
    • 1.Qh2+?
      • 1...Rg3
        • 2.Qxg3#
      • 1...Bxh2!
  • Keys
    • 1.Shg7!
      • threat
        • 2.Rf5#
      • 1...Qf1
        • 2.Qc3#
      • 1...Rf3
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 14
  • Sets
    • Q(a);N_GUARD::QAB(A),XQ(a)
    • Q(a);N_GUARD::QAB(A)
    • R(e);OGATE::QAB1(A)
    • B(d);OGATE::QAR1(A)
  • Tries
    • Try
      • S(F);
      • Threat
        • R1(D)
      • Vars
        • Q(a);N_GUARD::QAB(A)
        • B(d);::R1(D)
      • Refutation
        • P(i);
    • Try
      • Q(A);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAB(A),XR(e)
      • Refutation
        • B(b);XQ(A)
  • Actual
    • S(C);
    • Threat
      • R1(D)
    • Vars
      • Q(a);N_GUARD::QAB(A)
      • R(e);::R1(D)
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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).