MESON Chess Problem Database

Problem Display
PID: 275766 (8/2p1K3/1pR2B1p/1p1k4/N3n1Rr/8/8/2Q5 w - - 0 1)

Endrell, Gunnar

Schackvarlden, 1939

8/2p1K3/1pR2B1p/1p1k4/N3n1Rr/8/8/2Q5

#2

6 + 7

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...bxa4
      • 2.Qc4#
    • 1...b4
      • 2.Qc4#
  • Tries
    • 1.Rxb6?
      • threat
        • 2.Qc6#
      • 1...Sxf6
        • 2.Qc5#
      • 1...cxb6
        • 2.Sxb6#
      • 1...Sc3
        • 2.Qd2#
      • 1...Sc5
        • 2.Sc3#
        • 2.Qxc5#
      • 1...c6
        • 2.Qxc6#
      • 1...c5!
    • 1.Rd6+?
      • 1...cxd6
        • 2.Sxb6#
      • 1...Sxd6!
    • 1.Rxc7?
      • threat
        • 2.Sxb6#
        • 2.Qc6#
      • 1...bxa4
        • 2.Qc4#
        • 2.Qc6#
      • 1...Sc3
        • 2.Sxc3#
        • 2.Sxb6#
        • 2.Qd2#
      • 1...Sc5
        • 2.Sc3#
        • 2.Sxb6#
      • 1...Sxf6!
  • Keys
    • 1.Re6!
      • threat
        • 2.Qc6#
      • 1...Sc3
        • 2.Qd2#
      • 1...Sc5
        • 2.Sc3#
      • 1...Sd6
        • 2.Re5#
      • 1...c5
        • 2.Sxb6#
      • 1...c6
        • 2.Sxb6#
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • P(c);N_GUARD,XS(B)::QAB1(A)
    • P(c);N_GUARD::QAB1(A)
  • Tries
    • Try
      • R(D);XP(e)
      • Threat
        • QAB1(A)
      • Vars
        • S(a);N_GUARD,XB(E)::QAR1(A)
        • P(g);XR(D)::S(B),XP(g)
        • S(a);N_GUARD::QAR(A)
        • P(g);::QAB1(A),XP(g)
      • Refutation
        • P(g);
    • Try
      • R(D);CHECK
      • Vars
        • P(g);XR(D)::S(B),XP(e)
      • Refutation
        • S(a);XR(D)
    • Try
      • R(D);XP(g)
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);XB(E)
  • Actual
    • R(D);
    • Threat
      • QAB1(A)
    • Vars
      • S(a);N_GUARD::QAR(A)
      • S(a);N_GUARD,SBLOCK::S(B)
      • S(a);::R1(D)
      • P(g);N_GUARD::S(B),XP(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).