MESON Chess Problem Database

Problem Display
PID: 64756 (2BR2N1/2p2k1K/8/7p/p3pq2/6Nr/7Q/2bb1R2 w - - 0 1)

Palkoska, Emil

Good Companions (August), 1921

2BR2N1/2p2k1K/8/7p/p3pq2/6Nr/7Q/2bb1R2

#2

7 + 9

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5+
      • 2.Rxf5#
    • 1...Qf6
      • 2.Rxf6#
    • 1...Ba3
      • 2.Rxf4#
    • 1...Bf3
      • 2.Qa2#
    • 1...e3
      • 2.Rxf4#
  • Tries
    • 1.Qxh3?
      • threat
        • 2.Be6#
        • 2.Qe6#
        • 2.Qd7#
      • 1...Qf5+
        • 2.Rxf5#
        • 2.Qxf5#
      • 1...Ba3
        • 2.Be6#
        • 2.Rxf4#
        • 2.Qe6#
      • 1...Bb3
        • 2.Qd7#
        • 2.Qxh5#
      • 1...Bg4!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sfh6#
      • 1...Qh6+
        • 2.Sfxh6#
      • 1...Qxf5+
        • 2.Rxf5#
      • 1...Qxf1
        • 2.Qxc7#
      • 1...Qf2
        • 2.Qxc7#
      • 1...Qf3
        • 2.Qxc7#
      • 1...Rf3
        • 2.Qxh5#
      • 1...Bf3
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(f);CHECK,OGATE::R(A),XQ(f)
    • Q(f);OGATE::R1(A),XQ(f)
    • B(a);N_GUARD::R(A),XQ(f)
    • B(b);N_GUARD,N_SPINQ(f)::QAB(B)
    • P(e);S_CUTB(a)::R(A),XQ(f)
  • Tries
    • Try
      • Q(B);XR(c)
      • Threat
        • DUALS(3)
      • Refutation
        • B(b);
  • Actual
    • S(C);N_PINQ(f)
    • Threat
      • S(C)
    • Vars
      • Q(f);CHECK::R(A)+S(C),DCHECK,XQ(f)
      • Q(f);CHECK,OGATE,P_SPINQ(f),XS(C)::R(A),XQ(f)
      • Q(f);OGATE,XR(A)::QAR(B),XP(h)
      • Q(f);OGATE::QAR(B),XP(h)
      • R(c);OGATE::QAB(B),XP(g)
      • B(b);N_GUARD,S_CUTR(c)::QAB(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).