MESON Chess Problem Database

Problem Display
PID: 179999 (8/6p1/6B1/8/8/8/1Qpk1K2/3b4 w - - 0 1)

Fossum, Andre Ferdinand

Norsk Vanforetidsskrift, 1952

8/6p1/6B1/8/8/8/1Qpk1K2/3b4

#2

3 + 4

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Be2
      • 2.Qxc2#
    • 1...Bf3
      • 2.Qxc2#
    • 1...Bg4
      • 2.Qxc2#
    • 1...Bh5
      • 2.Qxc2#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qe3#
      • 1...Be2
        • 2.Qxc2#
      • 1...Bf3
        • 2.Qxc2#
      • 1...Bg4
        • 2.Qxc2#
      • 1...Bh5
        • 2.Qxc2#
      • 1...Kc1!
  • Keys
    • 1.Qa1!
      • 1...c1Q
        • 2.Qd4#
      • 1...c1S
        • 2.Qa5#
      • 1...c1B
        • 2.Qd4#
        • 2.Qa5#
      • 1...c1R
        • 2.Qd4#
      • 1...Be2
        • 2.Qe1#
      • 1...Bf3
        • 2.Qe1#
      • 1...Bg4
        • 2.Qe1#
      • 1...Bh5
        • 2.Qe1#

Anticipated by 22005(1923), 22080(1924), 109519(1934)

This anticipates 234085(1970), 102450(1988)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::QAR1(A),XP(b)
  • Tries
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAB1(A)
      • Vars
        • B(a);N_GUARD::QAR1(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(A);N_PINP(b)
    • Vars
      • P(b);SBLOCK::QAR2(A)
      • P(b);SBLOCK::QAB(A)
      • B(a);OGATE::QAB1(A)
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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).