MESON Chess Problem Database

Problem Display
PID: 32852 (1b4K1/1r1p1R2/4k3/2Q3p1/b7/3N4/8/8 w - - 0 1)

Akerblom, Johan Axel

De Problemist, 1929

1b4K1/1r1p1R2/4k3/2Q3p1/b7/3N4/8/8

#2

4 + 6

15148 Sadier Collection 2014
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rc7
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Bd6
      • 2.Qc4#
      • 2.Qf5#
    • 1...Ba7
      • 2.Qe5#
    • 1...d6
      • 2.Qf5#
  • Tries
    • 1.Kg7?
      • threat
        • 2.Rf6#
        • 2.Re7#
      • 1...Be5+
        • 2.Qxe5#
      • 1...Bd6
        • 2.Qc4#
        • 2.Qf5#
      • 1...d6
        • 2.Qf5#
      • 1...d5!
    • 1.Sb4?
      • threat
        • 2.Qe7#
        • 2.Qd5#
      • 1...d5
        • 2.Qxd5#
      • 1...Rb5
        • 2.Qe7#
      • 1...Bb3
        • 2.Qe7#
      • 1...Bc6
        • 2.Qe7#
      • 1...Bd6
        • 2.Qd5#
        • 2.Qf5#
      • 1...d6
        • 2.Qe3#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Rxb4!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Sc5#
      • 1...d5
        • 2.Qf6#
      • 1...Rb5
        • 2.Qxd7#
      • 1...Rc7
        • 2.Qe5#
      • 1...Bd6
        • 2.Qc4#
      • 1...Ba7
        • 2.Qe5#
      • 1...d6
        • 2.Qe4#

This anticipates 255130(1999)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(d);S_CUTB(f)::QAR1(B)
    • B(f);N_GUARD::QAR1(B),XB(f)
    • B(f);N_GUARD::QAR1(B)
    • P(e);SBLOCK::QAB1(B)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(f);CHECK,N_GUARD::QAR1(B),XB(f)
        • P(e);P_PINR(C),SBLOCK::QAB1(B)
      • Refutation
        • P(e);P_PINR(C)
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);::QAB1(B),XP(e)
        • R(d);::QAR1(B)
        • B(a);::QAR1(B)
      • Refutation
        • R(d);XS(A)
  • Actual
    • Q(B);
    • Threat
      • S(A)
    • Vars
      • P(e);SBLOCK::QAR1(B)
      • R(d);N_GUARD,S_CUTB(a)::QAB1(B),XP(e)
      • R(d);S_CUTB(f)::QAR1(B)
      • B(f);SBLOCK,S_CUTP(e)::QAB(B)
      • B(f);N_GUARD::QAR1(B)
      • P(e);SBLOCK,S_CUTB(f)::QAR2(B)
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).