MESON Chess Problem Database

Problem Display
PID: 102298 (8/6Q1/8/8/2p2n1p/8/5R2/3K3k w - - 0 1)

Mach, Julius Zdenek

Svenska Dagbladet, 1928

8/6Q1/8/8/2p2n1p/8/5R2/3K3k

#2

3 + 4

6490 yacpdb 2009
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Qg2#
    • 1...Sg2
      • 2.Qxg2#
    • 1...Sd3
      • 2.Qg2#
    • 1...Sh3
      • 2.Qg2#
    • 1...Sd5
      • 2.Qg2#
    • 1...Sh5
      • 2.Qg2#
    • 1...Se6
      • 2.Qg2#
  • Tries
    • 1.Kc2?
      • threat
        • 2.Qa1#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Se2
        • 2.Qg2#
      • 1...Sd3
        • 2.Qg2#
      • 1...Sh3
        • 2.Qg2#
      • 1...c3!
    • 1.Kd2?
      • threat
        • 2.Qa1#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Se2
        • 2.Qg2#
      • 1...Sd3
        • 2.Qg2#
      • 1...Sh3
        • 2.Qg2#
      • 1...c3+!
    • 1.Rxf4?
      • threat
        • 2.Rxh4#
      • 1...Kh2
        • 2.Rxh4#
      • 1...h3!
    • 1.Qg3?
      • threat
        • 2.Rf1#
        • 2.Rh2#
        • 2.Qh2#
      • 1...Sg2
        • 2.Rf1#
        • 2.Qxg2#
      • 1...Se2
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...Sh3
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...hxg3!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qe1#
      • 1...Kg1
        • 2.Qe1#
      • 1...Se2
        • 2.Qh2#
      • 1...Sg2
        • 2.Rf1#
      • 1...Sd3
        • 2.Qh2#
      • 1...Sh3
        • 2.Qh2#

This anticipates 249541(1983)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::QAB1(C)
    • S(c);N_GUARD::QAB1(C),XS(c)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • QAB1(C)
      • Vars
        • S(c);N_GUARD::QAB1(C),XS(c)
        • S(c);N_GUARD::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • K(A);P-FLIGHT
      • Threat
        • QAB1(C)
      • Vars
        • S(c);N_GUARD::QAB1(C),XS(c)
        • S(c);N_GUARD::QAB1(C)
      • Refutation
        • P(b);CHECK
    • Try
      • R(B);XS(c)
      • Threat
        • R(B),XP(d)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(d)
      • Refutation
        • P(d);
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Refutation
        • P(d);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • S(c);OGATE::QAR1(C)
      • S(c);SBLOCK::R(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).