MESON Chess Problem Database

Problem Display
PID: 4697 (2Br4/2p2n2/8/1P1k4/R2P4/6Q1/8/K2R4 w - - 0 1)

Jonsson, Hermann Leonard

Deutsche Schachzeitung, 1887

2Br4/2p2n2/8/1P1k4/R2P4/6Q1/8/K2R4

#2

7 + 4

3360 Simple Two-move Themes 1924
5501 Chess Cameos 1936
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.d5#
    • 1...Rd6
      • 2.Qg2#
      • 2.Qf3#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sg5
      • 2.Qe5#
    • 1...Sd6
      • 2.Qe5#
    • 1...Sh6
      • 2.Qe5#
    • 1...Sh8
      • 2.Qe5#
  • Tries
    • 1.Be6+?
      • 1...Ke4
        • 2.Re1#
        • 2.d5#
      • 1...Kxe6!
    • 1.Qb3+?
      • 1...Kd6
        • 2.Qe6#
      • 1...Ke4!
    • 1.Qg6?
      • threat
        • 2.Qc6#
        • 2.Qe6#
      • 1...Rxc8
        • 2.Qc6#
      • 1...Rd7
        • 2.Qc6#
      • 1...Rd6
        • 2.Qg2#
      • 1...Re8
        • 2.Qc6#
      • 1...Sg5
        • 2.Qc6#
      • 1...Sd6
        • 2.Be6#
        • 2.Qe6#
      • 1...c6
        • 2.Qxc6#
        • 2.Qe6#
      • 1...Se5!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qc6#
      • 1...Ke4
        • 2.d5#
      • 1...Kd6
        • 2.Qc5#
      • 1...Rd6
        • 2.Qf3#
      • 1...Se5
        • 2.dxe5#
      • 1...c5
        • 2.dxc5#
      • 1...c6
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • K(a);OGATE,S_FLIGHT::R(D)+P(E)
    • S(c);N_GUARD::QAR1(C),XS(c)
    • S(c);N_GUARD::QAR1(C)
  • Tries
    • Try
      • B(G);CHECK
      • Refutation
        • K(a);S_FLIGHT,XB(G)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(d);XB(G)::QAB1(C)
        • R(d);::QAB1(C)
        • R(d);SBLOCK::QAB(C)
        • S(c);::QAB1(C)
      • Refutation
        • S(c);
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • K(a);OGATE,S_FLIGHT::R(D)+P(E)
      • K(a);P-FLIGHT::QAB1(C)
      • R(d);SBLOCK::QAB(C)
      • S(c);OGATE::R(B)+P(E),XS(c)
      • P(b);OGATE::R(B)+P(E),XP(b)
      • P(b);::QAB1(C),XP(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).