MESON Chess Problem Database

Problem Display
PID: 250073 (8/p1p1Kpn1/2N4p/Rn1Qbk2/b1p3RB/pN1r3P/2B1r3/q7 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

3rd Prize, Shakhmaty, 1927

8/p1p1Kpn1/2N4p/Rn1Qbk2/b1p3RB/pN1r3P/2B1r3/q7

#2

9 + 14

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qe4#
    • 1...Rd2
      • 2.Qe4#
    • 1...Rf2
      • 2.Qe4#
    • 1...Rg2
      • 2.Qe4#
    • 1...Rh2
      • 2.Qe4#
    • 1...Re4
      • 2.Qxe4#
    • 1...Sc3
      • 2.Sbd4#
      • 2.Scd4#
      • 2.Qf3#
      • 2.Qxf7#
    • 1...Sd4
      • 2.Qxf7#
    • 1...Sd6
      • 2.Qf3#
    • 1...Sh5
      • 2.Qd7#
    • 1...Se8
      • 2.Qd7#
  • Tries
    • 1.Sbd4+?
      • 1...Sxd4
        • 2.Qxf7#
      • 1...Qxd4!
    • 1.Scd4+?
      • 1...Sxd4
        • 2.Qxf7#
      • 1...Qxd4!
    • 1.Bxd3+?
      • 1...Re4
        • 2.Bxe4#
        • 2.Qxe4#
      • 1...cxd3!
    • 1.Qxd3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...cxd3!
  • Keys
    • 1.Kd7!
      • threat
        • 2.Se7#
      • 1...Sc3
        • 2.Sd4#
      • 1...Sd4
        • 2.Qxf7#
      • 1...Sd6
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • R(b);N_GUARD,N_SPINR(d),XB(A)::QAB1(G)
    • R(b);N_GUARD::QAB1(G)
    • R(b);N_GUARD,N_SPINR(d)::QAB1(G),XR(b)
    • S(g);::QAR2(G),XP(m)
    • S(g);::QAR2(G)
    • S(n);N_GUARD::QAB(G)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • S(g);XS(B)::QAR2(G),XP(m)
      • Refutation
        • Q(a);XS(B)
    • Try
      • S(H);CHECK
      • Vars
        • S(g);XS(H)::QAR2(G),XP(m)
      • Refutation
        • Q(a);XS(H)
    • Try
      • B(A);CHECK,XR(d)
      • Refutation
        • P(f);XB(A)
    • Try
      • Q(G);CHECK,N_PINB(h),XR(d)
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(G),XR(b)
      • Refutation
        • P(f);P_SPINP(f),XQ(G)
  • Actual
    • K(I);P-FLIGHT,P_SPINQ(G)
    • Threat
      • S(H)
    • Vars
      • S(g);N_GUARD,P_PINS(H),S_CUTQ(a)::S(B)
      • S(g);N_PINQ(G),P_PINS(H)::QAR2(G),XP(m)
      • S(g);N_PINQ(G),P_PINS(H)::QAR2(G)
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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).