MESON Chess Problem Database

Problem Display
PID: 173679 (4Q3/1p2N2p/2PKpP1P/8/1R1pk1p1/4Pqp1/4R1n1/b1B1N2B w - - 0 1)

Boros, Sandor

Valko, Odon

HM., Upsala, 1925

4Q3/1p2N2p/2PKpP1P/8/1R1pk1p1/4Pqp1/4R1n1/b1B1N2B

#2

12 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4+
      • 2.exf4#
    • 1...Qf5
      • 2.exd4#
    • 1...Qxf6
      • 2.exd4#
    • 1...Sf4
      • 2.exf4#
    • 1...Sh4
      • 2.exd4#
    • 1...bxc6
      • 2.Qxc6#
  • Tries
    • 1.Qh5?
      • threat
        • 2.Qe5#
      • 1...Qf4+
        • 2.exf4#
      • 1...Qxf6
        • 2.exd4#
      • 1...Qf5
        • 2.exd4#
      • 1...e5
        • 2.Qxe5#
      • 1...Sxe1!
    • 1.Qg6+?
      • 1...Qf5
        • 2.Bxg2#
        • 2.exd4#
      • 1...hxg6!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Qxe6#
      • 1...Qf4+
        • 2.exf4#
      • 1...Qxe3
        • 2.Qxg4#
      • 1...Qxf6
        • 2.exd4#
      • 1...Sxe1
        • 2.Qxh7#
      • 1...Sxe3
        • 2.Qxg4#
      • 1...Qf5
        • 2.exd4#
      • 1...Sf4
        • 2.exf4#
      • 1...e5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(c);CHECK,OGATE,P_SPINS(b)::R(D)+P(E),XQ(c)
    • Q(c);N_GUARD,P_SPINS(b)::R(D)+P(E),XP(e)
    • Q(c);N_GUARD,P_SPINS(b),XP(I)::R(D)+P(E),XP(e)
    • S(b);OGATE,P_SPINQ(c)::R(D)+P(E),XS(b)
    • S(b);N_GUARD,P_SPINQ(c)::R(D)+P(E),XP(e)
    • P(i);OGATE,XP(G)::QAB(L),XP(i)
  • Tries
    • Try
      • Q(L);
      • Threat
        • QAR1(L)
      • Vars
        • Q(c);CHECK,OGATE,P_SPINS(b)::R(D)+P(E),XQ(c)
        • Q(c);N_GUARD,P_SPINS(b),XP(I)::R(D)+P(E),XP(e)
        • Q(c);N_GUARD,P_SPINS(b)::R(D)+P(E),XP(e)
        • P(h);::QAR1(L),XP(h)
      • Refutation
        • S(b);P_SPINQ(c),XS(B)
    • Try
      • Q(L);CHECK
      • Refutation
        • P(j);XQ(L)
  • Actual
    • Q(L);
    • Threat
      • QAR2(L),XP(h)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINS(b)::R(D)+P(E),XQ(c)
      • Q(c);N_GUARD,P_SPINQ(c),P_SPINS(b),XP(E)::QAR2(L),XP(g)
      • Q(c);N_GUARD,P_SPINS(b),XP(I)::R(D)+P(E),XP(e)
      • S(b);P_SPINQ(c),XS(B)::QAB(L),XP(j)
      • S(b);N_GUARD,P_SPINQ(c),P_SPINS(b),XP(E)::QAR2(L),XP(g)
      • Q(c);N_GUARD,P_SPINS(b)::R(D)+P(E),XP(e)
      • S(b);OGATE,P_SPINQ(c)::R(D)+P(E),XS(b)
      • P(h);OGATE::QAB1(L)
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).