MESON Chess Problem Database

Problem Display
PID: 262401 (QBB4b/7b/8/2pPr1Rn/2p1kP2/2Ppp1p1/8/K4NN1 w - - 0 1)

Labai, Zoltan

2nd HM., Polski Zwiazek Szachowy, 2020

(First published on Tue Mar 17 2020)

QBB4b/7b/8/2pPr1Rn/2p1kP2/2Ppp1p1/8/K4NN1

#2

10 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf4
      • 2.Rg4#
    • 1...Rxd5
      • 2.Qxd5#
    • 1...Re6
      • 2.dxe6#
    • 1...Sxf4
      • 2.Sxg3#
  • Tries
    • 1.Sd2+?
      • 1...Kxf4
        • 2.Sh3#
        • 2.Rg4#
      • 1...exd2!
    • 1.Sxg3+?
      • 1...Kxf4
        • 2.Rg4#
      • 1...Sxg3!
    • 1.d6+?
      • 1...Kxf4
        • 2.Sh3#
        • 2.Rg4#
      • 1...Rd5!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Qxc4#
      • 1...Kxf4
        • 2.Rg4#
      • 1...Kxd5
        • 2.Qa8#
      • 1...Rxd5
        • 2.Qg2#
      • 1...Rxg5
        • 2.Qg2#
      • 1...Rf5
        • 2.Qg2#
      • 1...Re6
        • 2.Qg2#
      • 1...Re7
        • 2.Qg2#
      • 1...Re8
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • K(e);OGATEB,P-FLIGHT,P_SPINR(g),XP(E)::R1(G)
    • R(g);OGATE,P_PINP(D),P_SPINR(g),XP(F)::QAB1(H),XR(g)
    • R(g);OGATE,P_PINP(D)::QAB(H)+P(F),XR(g)
    • S(h);N_GUARD,SBLOCK,XP(E)::S(B),XP(c)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • P(b);XS(B)
    • Try
      • S(B);CHECK,XP(c)
      • Vars
        • K(e);P-FLIGHT,P_SPINR(g),S_CUTS(h),XP(E)::R1(G)
      • Refutation
        • S(h);XS(B)
    • Try
      • P(F);CHECK
      • Refutation
        • R(g);P_PINP(D),P_SPINR(g)
  • Actual
    • Q(H);
    • Threat
      • QAR2(H),XP(d)
    • Vars
      • K(e);OGATEB,P-FLIGHT,P_SPINR(g),XP(E)::R1(G)
      • K(e);OGATEB,P_SPINP(d),P_SPINR(g),S_FLIGHT,XP(F)::QAB(H)
      • R(g);P_PINP(D),XP(F)::QAB(H)
      • R(g);P_PINP(D),XR(G)::QAB(H)
      • R(g);P_PINP(D)::QAB(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).