MESON Chess Problem Database

Problem Display
PID: 208870 (8/4K3/4BN2/4k3/3p4/P1p1r1P1/4P3/Q7 w - - 0 1)

Martindale, Frank W

Detroit Free Press, 1876

8/4K3/4BN2/4k3/3p4/P1p1r1P1/4P3/Q7

#2

7 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sd7#
    • 1...d3
      • 2.Qxc3#
  • Tries
    • 1.Qb2?
      • threat
        • 2.Qb5#
        • 2.Qb8#
      • 1...Rxg3
        • 2.Qb8#
      • 1...d3
        • 2.Qxc3#
      • 1...cxb2!
    • 1.Qb1?
      • threat
        • 2.Sg4#
        • 2.Sd7#
        • 2.Qf5#
        • 2.Qb5#
        • 2.Qb8#
      • 1...Rxg3
        • 2.Qe4#
        • 2.Qf5#
        • 2.Qb8#
      • 1...Rd3
        • 2.Qb5#
        • 2.Qb8#
      • 1...Rf3
        • 2.Sg4#
        • 2.Sd7#
        • 2.Qe4#
        • 2.Qb5#
        • 2.Qb8#
      • 1...Re4
        • 2.Sd7#
        • 2.Qxe4#
        • 2.Qb5#
        • 2.Qb8#
      • 1...c2
        • 2.Qb5#
        • 2.Qb8#
      • 1...d3!
    • 1.Qf1?
      • threat
        • 2.Qf4#
        • 2.Qf5#
      • 1...Rxg3
        • 2.Qf5#
      • 1...d3
        • 2.Qf4#
      • 1...Re4
        • 2.Sd7#
        • 2.Qf5#
      • 1...Rf3!
    • 1.Qh1?
      • threat
        • 2.Sg4#
        • 2.Sd7#
        • 2.Qd5#
        • 2.Qh5#
      • 1...Rxg3
        • 2.Qe4#
      • 1...d3
        • 2.Qd5#
      • 1...Re4
        • 2.Sd7#
        • 2.Qxe4#
        • 2.Qh5#
      • 1...Rf3!
  • Keys
    • 1.Qe1!
      • 1...Rxe2
        • 2.Qxe2#
      • 1...Rxg3
        • 2.Qxg3#
      • 1...d3
        • 2.Qxc3#
      • 1...Rd3
        • 2.exd3#
      • 1...Rf3
        • 2.exf3#
      • 1...Re4
        • 2.Sd7#
      • 1...c2
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK::S(F)
    • P(c);OGATEB,P_SPINP(a)::QAB(A),XP(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(D)::QAB(A)
        • P(c);OGATEB,P_SPINP(a)::QAB(A),XP(a)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(5)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(D)::QAR1(A)
        • P(c);::QAB1(A)
      • Refutation
        • R(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • R(b);N_GUARD,XP(D)::QAR1(A)
        • P(c);::QAR1(A)
      • Refutation
        • R(b);
  • Actual
    • Q(A);
    • Vars
      • R(b);OGATE,P_SPINR(b),XP(B)::QAR(A),XR(b)
      • R(b);OGATE,XP(D)::QAB(A),XR(b)
      • P(c);OGATEB::QAB(A),XP(a)
      • R(b);OGATE::QAR(A)+P(B),XR(b)
      • R(b);SBLOCK::S(F)
      • P(a);OGATE::QAR(A)
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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).