MESON Chess Problem Database

Problem Display
PID: 252949 (1k4q1/2RpN3/pB2p3/4r3/8/p5r1/7Q/KR4nB w - - 0 1)

Haring, Jacobus

Die Schwalbe, 1965

1k4q1/2RpN3/pB2p3/4r3/8/p5r1/7Q/KR4nB

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qf7
      • 2.Rc8#
    • 1...Qh7
      • 2.Rc8#
    • 1...Qg4
      • 2.Rc8#
    • 1...Qg5
      • 2.Rc8#
    • 1...Qg6
      • 2.Rc8#
    • 1...Qg7
      • 2.Rc8#
    • 1...Qc8
      • 2.Rxc8#
  • Tries
    • 1.Sc6+?
      • 1...Ka8
        • 2.Ra7#
      • 1...dxc6!
  • Keys
    • 1.Ra7!
      • threat
        • 2.Ra8#
      • 1...Rg2
        • 2.Bf2#
      • 1...Rf3
        • 2.Be3#
      • 1...Re4
        • 2.Bd4#
      • 1...Rd5
        • 2.Bc5#
      • 1...Sf3
        • 2.Bc5#
      • 1...d5
        • 2.Be3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • Q(i);N_GUARD::R1(F)
    • Q(i);N_GUARD::R1(F),XQ(i)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(h);N_GUARD,P-FLIGHT,S_CUTP(g)::R1(F)
      • Refutation
        • P(g);XS(G)
  • Actual
    • R(F);
    • Threat
      • R1(F)
    • Vars
      • R(c);N_GUARD,P_SPINR(d)::R(B)+B(E)
      • R(c);P_SPINR(d)::R(B)+B(E)
      • R(d);N_GUARD,P_SPINR(c)::R(B)+B(E)
      • R(d);P_SPINR(c)::R(B)+B(E)
      • S(a);S_CUTR(c)::R(B)+B(E)
      • P(g);S_CUTR(d)::R(B)+B(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).