MESON Chess Problem Database

Problem Display
PID: 249703 (qn2QBB1/8/1p6/8/3k4/R4P2/p5r1/K2N2bn w - - 0 1)

Andersson, Sven Tore

Schakend Nederland, 1962

qn2QBB1/8/1p6/8/3k4/R4P2/p5r1/K2N2bn

#2

7 + 8

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qxa3
      • 2.Qe4#
    • 1...Qa4
      • 2.Qe4#
    • 1...Qa5
      • 2.Qe4#
    • 1...Qa6
      • 2.Qe4#
    • 1...Qa7
      • 2.Qe4#
    • 1...Rf2
      • 2.Qe3#
    • 1...Bh2
      • 2.Qe3#
    • 1...Be3
      • 2.Qxe3#
    • 1...Sf2
      • 2.Qe3#
    • 1...Sc6
      • 2.Qe4#
  • Tries
    • 1.Ra4+?
      • 1...Qxa4
        • 2.Qe4#
      • 1...Kd3!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Rd3#
      • 1...Qxf3
        • 2.Ra4#
      • 1...Qxa3
        • 2.Qd5#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Qe4
        • 2.Ra4#
      • 1...Rd2
        • 2.Bg7#
      • 1...Sf2
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(g);N_GUARD::QAR1(E),XQ(g)
    • Q(g);N_GUARD,XR(C)::QAR1(E)
    • Q(g);N_GUARD::QAR1(E)
    • R(d);S_CUTB(a)::QAB1(E)
    • B(a);N_GUARD::QAB1(E)
    • B(a);N_GUARD::QAB1(E),XB(a)
    • S(b);S_CUTB(a)::QAB1(E)
    • S(h);S_CUTQ(g)::QAR1(E)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • Q(g);XR(C)::QAR1(E)
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • Q(E);
    • Threat
      • R1(C)
    • Vars
      • Q(g);N_GUARD,XP(D)::R(C)
      • Q(g);N_GUARD,XR(C)::QAR1(E)
      • Q(g);N_GUARD::QAR1(E),XQ(g)
      • Q(g);N_GUARD::R(C)
      • R(d);N_GUARD::B(F)
      • S(b);S_CUTR(d)::QAB(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).