MESON Chess Problem Database

Problem Display
PID: 86697 (3r4/4p3/4Q3/2b5/8/3k1p1N/3P4/3K4 w - - 0 1)

Gross, Erwin

Die Schwalbe, 1968

3r4/4p3/4Q3/2b5/8/3k1p1N/3P4/3K4

#2

4 + 5

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Sf2#
    • 1...Bd4
      • 2.Sf4#
    • 1...Bd6
      • 2.Qd5#
  • Tries
    • 1.Sf2+?
      • 1...Kd4
        • 2.Qe4#
      • 1...Bxf2!
    • 1.Qd5+?
      • 1...Bd4
        • 2.Sf2#
        • 2.Sf4#
      • 1...Rxd5!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qe4#
      • 1...Kd4
        • 2.Qe4#
      • 1...Rd4
        • 2.Qb3#
      • 1...Bd4
        • 2.Qa6#

This anticipates 239258(1975)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(e);SBLOCK,S_CUTB(c)::S(C)
    • B(c);SBLOCK::S(C)
    • B(c);N_GUARD,S_CUTR(e)::QAR2(D)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
      • Refutation
        • B(c);XS(C)
    • Try
      • Q(D);CHECK
      • Refutation
        • R(e);XQ(D)
  • Actual
    • S(C);
    • Threat
      • QAB1(D)
    • Vars
      • K(a);P-FLIGHT::QAR1(D)
      • R(e);SBLOCK::QAR2(D)
      • B(c);SBLOCK::QAB(D)
HTML5 logo

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).