MESON Chess Problem Database

Problem Display
PID: 187966 (R7/5p1K/q4B2/1Q6/Bp6/1R6/k1P5/8 w - - 0 1)

Palkoska, Emil

Tidskrift for Schack, 1910

R7/5p1K/q4B2/1Q6/Bp6/1R6/k1P5/8

#2

7 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb5
      • 2.Bxb5#
    • 1...Qxa4
      • 2.Rxa4#
      • 2.Qxa4#
  • Tries
    • 1.Rb2+?
      • 1...Ka3
        • 2.Qxb4#
      • 1...Ka1!
    • 1.Ra3+?
      • 1...Kb1
        • 2.Ra1#
      • 1...bxa3
        • 2.Qb3#
      • 1...Kxa3!
    • 1.Qf1?
      • threat
        • 2.Qa1#
        • 2.Qb1#
      • 1...Qxf1
        • 2.Bb5#
      • 1...Qxf6
        • 2.Bc6#
        • 2.Qb1#
      • 1...Qd3+!
    • 1.Qxb4?
      • threat
        • 2.Ra3#
        • 2.Qa3#
      • 1...Qxa4
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Qd6
        • 2.Bc6#
        • 2.Ra3#
      • 1...Qd3+!
    • 1.Qe5?
      • threat
        • 2.Qa1#
        • 2.Qb2#
      • 1...Qxf6
        • 2.Bc6#
      • 1...Qf1
        • 2.Bb5#
        • 2.Qb2#
      • 1...Qd3+!
  • Keys
    • 1.Qe2!
      • threat
        • 2.c4#
      • 1...Qd3+
        • 2.cxd3#
      • 1...Qxe2
        • 2.Bb5#
      • 1...Qxa4
        • 2.Rxa4#
      • 1...Qxf6
        • 2.Bc6#
      • 1...Qc4
        • 2.Bb5#
      • 1...Qd6
        • 2.Bc6#
      • 1...Qe6
        • 2.Bc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE,XQ(D)::R(G)+B(C),XQ(c)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(D),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(B);CHECK
      • Vars
        • K(a);OGATE,P_SPINP(b),S_FLIGHT::R1(B)
        • P(b);OGATE,XR(B)::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT,XR(B)
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);OGATEB,XQ(D)::R(G)+B(C)
      • Refutation
        • Q(c);CHECK
    • Try
      • Q(D);XP(b)
      • Threat
        • DUALS(2)
      • Refutation
        • Q(c);CHECK
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);OGATEB,XB(E)::R(G)+B(C)
      • Refutation
        • Q(c);CHECK
  • Actual
    • Q(D);
    • Threat
      • QAR(D)+P(A)
    • Vars
      • Q(c);CHECK,OGATE::QAR(D)+P(A),XQ(c)
      • Q(c);OGATEB,XQ(D)::R(G)+B(C)
      • Q(c);OGATE,P_SPINQ(c),XB(C)::R(G),XQ(c)
      • Q(c);OGATEB,XB(E)::R(G)+B(C)
      • Q(c);OGATEB::R(G)+B(C)
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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).