MESON Chess Problem Database

Problem Display
PID: 90750 (8/5Q1b/p1PP3B/P1K1pp2/4Pr2/3pkNN1/4P1r1/4RR2 w - - 0 1)

Gockel, Hubert

Die Schwalbe, 1985

8/5Q1b/p1PP3B/P1K1pp2/4Pr2/3pkNN1/4P1r1/4RR2

#2

12 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...dxe2
      • 2.Qb3#
    • 1...d2
      • 2.Qb3#
  • Tries
    • 1.Kb4?
      • threat
        • 2.Qa7#
      • 1...dxe2
        • 2.Qb3#
      • 1...Rxg3!
    • 1.Kc4?
      • threat
        • 2.Qa7#
      • 1...Rxg3
        • 2.exd3#
      • 1...Bg8!
    • 1.Kd5?
      • threat
        • 2.Qa7#
      • 1...Bg8
        • 2.Sxf5#
      • 1...dxe2!
    • 1.Sxf5+?
      • 1...Kxe4
        • 2.Sd2#
      • 1...Bxf5!
    • 1.Qa2?
      • threat
        • 2.Qd2#
      • 1...d2
        • 2.Qb3#
        • 2.Qxd2#
        • 2.Qa3#
      • 1...Rxg3!
    • 1.Qb3?
      • threat
        • 2.Qxd3#
      • 1...Rxe2
        • 2.Rxe2#
      • 1...fxe4!
    • 1.exd3+?
      • 1...Kxd3
        • 2.Qb3#
        • 2.Qc4#
      • 1...Re2!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Kb4#
        • 2.Kc4#
        • 2.Kd5#
      • 1...Rxg3
        • 2.Kd5#
      • 1...dxe2
        • 2.Kc4#
      • 1...Bg8
        • 2.Kb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATEB,P_SPINP(b),XP(C)::QAR(L)
    • P(b);OGATEB::QAR(L)
  • Tries
    • Try
      • K(H);P_SPINP(F),S_FLIGHT
      • Threat
        • QAB(L)
      • Vars
        • P(b);OGATEB,P_SPINP(b),XP(C)::QAR(L)
      • Refutation
        • R(a);XS(E)
    • Try
      • K(H);P-FLIGHT,P_SPINP(F)
      • Threat
        • QAB(L)
      • Vars
        • R(a);N_GUARD,XS(E)::R(A)+P(C),XP(b)
      • Refutation
        • B(h);P_PINQ(L)
    • Try
      • K(H);P-FLIGHT
      • Threat
        • QAB(L)
      • Vars
        • B(h);N_GUARD,P_PINQ(L)::S(E),XP(f)
      • Refutation
        • P(b);P_SPINP(b),XP(C)
    • Try
      • S(E);CHECK,XP(f)
      • Vars
        • K(c);N_SPINR(d),P-FLIGHT,XP(F)::S(D)
      • Refutation
        • B(h);XS(E)
    • Try
      • Q(L);
      • Threat
        • QAB1(L)
      • Refutation
        • R(a);XS(E)
    • Try
      • Q(L);P_PINP(b)
      • Threat
        • QAR1(L),XP(b)
      • Vars
        • R(a);N_SPINR(d),OGATE,P_SPINR(a),XP(C)::R1(A),XR(a)
      • Refutation
        • P(f);XP(F)
    • Try
      • P(C);CHECK,XP(b)
      • Refutation
        • R(a);N_SPINR(d),P_SPINR(a)
  • Actual
    • Q(L);
    • Threat
      • DUALS(3)
    • Vars
      • R(a);XS(E)::QAB(L)+K(H)
      • P(b);P_SPINP(b),XP(C)::QAB(L)+K(H)
      • B(h);::QAB(L)+K(H)
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).