MESON Chess Problem Database

Problem Display
PID: 90191 (1BK3n1/3Q3B/3Ppb2/3pk3/2pp3R/3q1Rp1/2p5/6r1 w - - 0 1)

Wielgos, Oskar

Die Schwalbe, 1984

1BK3n1/3Q3B/3Ppb2/3pk3/2pp3R/3q1Rp1/2p5/6r1

#2

7 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be7
      • 2.dxe7#
    • 1...Se7+
      • 2.dxe7#
  • Tries
    • 1.Re4+?
      • 1...dxe4
        • 2.Qb5#
      • 1...Qxe4!
    • 1.Qb5?
      • threat
        • 2.d7#
      • 1...Se7+
        • 2.dxe7#
      • 1...Qa3
        • 2.Re4#
      • 1...Be7
        • 2.dxe7#
      • 1...Bd8!
    • 1.Qe7?
      • threat
        • 2.d7#
      • 1...Sxe7+
        • 2.dxe7#
      • 1...Bxe7
        • 2.dxe7#
      • 1...Qa3
        • 2.Rf5#
      • 1...Qb3
        • 2.Rf5#
      • 1...Rb1!
  • Keys
    • 1.Qg7!
      • threat
        • 2.d7#
      • 1...Se7+
        • 2.dxe7#
      • 1...Qa3
        • 2.Rh5#
      • 1...Qb3
        • 2.Rh5#
      • 1...Rb1
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(j);OGATE::B(F)+P(C),XB(j)
    • S(k);CHECK,OGATE::B(F)+P(C),XS(k)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • P(g);S_CUTQ(c),XR(B)::QAR(D)
      • Refutation
        • Q(c);XR(B)
    • Try
      • Q(D);P_PINP(g)
      • Threat
        • B(F)+P(C)
      • Vars
        • S(k);CHECK,OGATE::B(F)+P(C),XS(k)
        • Q(c);N_GUARD::R1(B)
        • B(j);OGATE::B(F)+P(C),XB(j)
      • Refutation
        • B(j);
    • Try
      • Q(D);P_PINP(i)
      • Threat
        • B(F)+P(C)
      • Vars
        • S(k);CHECK,N_SPINP(i),OGATE,XQ(D)::B(F)+P(C),XS(k)
        • B(j);N_SPINP(i),OGATE,XQ(D)::B(F)+P(C),XB(j)
        • Q(c);N_GUARD::R1(A)
      • Refutation
        • R(a);
  • Actual
    • Q(D);P_PINB(j)
    • Threat
      • B(F)+P(C)
    • Vars
      • S(k);CHECK,OGATE::B(F)+P(C),XS(k)
      • Q(c);N_GUARD::R(B)
      • R(a);N_GUARD::QAB(D),XP(d)
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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).