MESON Chess Problem Database

Problem Display
PID: 250182 (6bb/4Q3/2N5/1B1k4/r2P2r1/1p2p1p1/1q1RN1K1/2n5 w - - 0 1)

Isaev, Leonid Antonovich

L'Echiquier, 1927

6bb/4Q3/2N5/1B1k4/r2P2r1/1p2p1p1/1q1RN1K1/2n5

#2

7 + 10

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Sc3#
    • 1...Qc3
      • 2.Sxc3#
    • 1...Qxd4
      • 2.Sc3#
    • 1...Qb1
      • 2.Sc3#
    • 1...Qa2
      • 2.Sc3#
    • 1...Ra1
      • 2.Sb4#
    • 1...Ra2
      • 2.Sb4#
    • 1...Ra3
      • 2.Sb4#
    • 1...Rb4
      • 2.Sxb4#
    • 1...Raxd4
      • 2.Sb4#
    • 1...Ra5
      • 2.Sb4#
    • 1...Ra6
      • 2.Sb4#
    • 1...Ra7
      • 2.Sb4#
    • 1...Ra8
      • 2.Sb4#
    • 1...Rgxd4
      • 2.Sf4#
    • 1...Re4
      • 2.Qd7#
    • 1...Rf4
      • 2.Sxf4#
    • 1...Rg5
      • 2.Sf4#
    • 1...Rg6
      • 2.Sf4#
    • 1...Rg7
      • 2.Sf4#
      • 2.Qe5#
    • 1...Bxd4
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
  • Keys
    • 1.Kf3!
      • threat
        • 2.Qd7#
      • 1...Rf4+
        • 2.Sxf4#
      • 1...Qxd4
        • 2.Sc3#
      • 1...Raxd4
        • 2.Sb4#
      • 1...Rgxd4
        • 2.Sf4#
      • 1...Bxd4
        • 2.Qe5#
      • 1...Qa3
        • 2.Sc3#
      • 1...Ra7
        • 2.Sb4#
      • 1...Rg6
        • 2.Sf4#
      • 1...Rg7
        • 2.Sf4#
        • 2.Qe5#
      • 1...Be6
        • 2.Qc5#
      • 1...Be5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • Q(b);N_GUARD::S(B)
    • Q(b);N_GUARD::S(B),XQ(b)
    • Q(b);N_GUARD,P_SPINQ(b),XP(D)::S(B)
    • R(f);N_GUARD::S(F)
    • R(f);N_GUARD::S(F),XR(f)
    • R(f);N_GUARD,P_SPINR(f),XP(D)::S(F)
    • R(g);N_GUARD,P_SPINR(g),XP(D)::S(B)
    • R(g);SBLOCK::QAR2(G)
    • R(g);N_GUARD::S(B),XR(g)
    • R(g);N_GUARD::S(B)
    • B(j);N_GUARD,P_SPINB(j),XP(D)::QAR1(G)
    • B(j);N_GUARD::QAR1(G),XB(j)
  • Actual
    • K(C);S_FLIGHT
    • Threat
      • QAR2(G)
    • Vars
      • R(g);CHECK,N_GUARD::S(B),XR(g)
      • Q(b);N_GUARD,P_SPINQ(b),XP(D)::S(B)
      • R(f);N_GUARD,P_SPINR(f),XP(D)::S(F)
      • R(g);N_GUARD,P_SPINR(g),XP(D)::S(B)
      • B(j);N_GUARD,P_SPINB(j),XP(D)::QAR1(G)
      • Q(b);N_GUARD::S(B)
      • R(f);N_GUARD::S(F)
      • R(g);N_GUARD::S(B)
      • B(i);SBLOCK::QAR1(G)
      • B(j);N_GUARD::QAR1(G),XB(j)
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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).