MESON Chess Problem Database

Problem Display
PID: 44066 (2n5/1bPB4/3pNpN1/1P1kb1qR/R1p1p3/B4p2/K2P4/3Q4 w - - 0 1)

Katko, Imre

Het Schaakleven, 1931

2n5/1bPB4/3pNpN1/1P1kb1qR/R1p1p3/B4p2/K2P4/3Q4

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2+
      • 2.Qxd2#
    • 1...Qe3
      • 2.dxe3#
    • 1...Qf4
      • 2.Sgxf4#
    • 1...Qg1
      • 2.Sgf4#
    • 1...Qg2
      • 2.Sgf4#
    • 1...Bc3
      • 2.dxc3#
    • 1...Bd4
      • 2.Sef4#
    • 1...Sb6
      • 2.Se7#
    • 1...Sa7
      • 2.Se7#
    • 1...Se7
      • 2.Sxe7#
    • 1...c3
      • 2.Qb3#
    • 1...e3
      • 2.Qxf3#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qxc4#
      • 1...Qxd2
        • 2.Qxd2#
      • 1...Sb6
        • 2.Se7#
      • 1...c3
        • 2.Qb3#
        • 2.Qxe4#
      • 1...Bc3!
    • 1.Qe2?
      • threat
        • 2.Qxc4#
      • 1...Qxd2+
        • 2.Qxd2#
      • 1...Sb6
        • 2.Se7#
      • 1...c3
        • 2.Qc4#
        • 2.Qxe4#
      • 1...fxe2!
    • 1.Qf1?
      • threat
        • 2.Qxc4#
      • 1...Sb6
        • 2.Se7#
      • 1...c3
        • 2.Qc4#
      • 1...Qxd2+!
  • Keys
    • 1.Ra5!
      • threat
        • 2.b6#
      • 1...Qxd2+
        • 2.Qxd2#
      • 1...c3
        • 2.Qb3#
      • 1...e3
        • 2.Qxf3#
      • 1...Qe3
        • 2.dxe3#
      • 1...Qg1
        • 2.Sgf4#
      • 1...Bc3
        • 2.dxc3#
      • 1...Bd4
        • 2.Sef4#
      • 1...Ba6
        • 2.bxa6#
      • 1...Bc6
        • 2.bxc6#
      • 1...Sb6
        • 2.Se7#
      • 1...Sa7
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(f);CHECK,OGATE,P_SPINB(e),P_SPINQ(f),XP(C)::QAR(A),XQ(f)
    • Q(f);OGATE,P_SPINB(e)::QAR(A)+P(C),XQ(f)
    • Q(f);N_GUARD,P_SPINB(e)::S(I),XQ(f)
    • Q(f);N_GUARD,P_SPINB(e)::S(I)
    • Q(f);N_GUARD,P_PINP(C),P_SPINB(e)::S(I)
    • B(e);OGATE,P_SPINQ(f)::QAR(A)+P(C),XB(e)
    • B(e);N_GUARD,P_SPINQ(f),SBLOCK::S(H)
    • S(j);N_GUARD::S(I)
    • S(j);N_GUARD::S(I),XS(j)
    • P(b);OGATEB::QAB(A)
    • P(c);OGATEB::QAB(A),XP(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • Q(f);OGATE,P_PINQ(A),P_SPINB(e),XP(C)::QAR(A),XQ(f)
        • S(j);N_GUARD::S(I)
      • Refutation
        • B(e);P_SPINQ(f)
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • Q(f);CHECK,OGATE,P_SPINB(e),XP(C)::QAR(A),XQ(f)
        • S(j);N_GUARD::S(I)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • S(j);N_GUARD::S(I)
        • P(b);::QAB1(A)
      • Refutation
        • Q(f);CHECK,P_SPINB(e),XP(C)
  • Actual
    • R(E);
    • Threat
      • R(E)+P(F)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINB(e),P_SPINQ(f),XP(C)::QAR(A),XQ(f)
      • P(b);OGATEB::QAB(A)
      • P(c);OGATEB::QAB(A),XP(a)
      • Q(f);OGATE,P_SPINB(e)::QAR(A)+P(C),XQ(f)
      • Q(f);N_GUARD,P_SPINB(e)::S(I)
      • B(e);OGATE,P_SPINQ(f)::QAR(A)+P(C),XB(e)
      • B(e);N_GUARD,P_SPINQ(f),SBLOCK::S(H)
      • B(i);OGATE::R(E)+P(F),XB(i)
      • S(j);N_GUARD::S(I)
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).