MESON Chess Problem Database

Problem Display
PID: 263870 (5K2/1N1p4/5p2/Q1N5/P2k1BR1/q2P1B2/1pn5/3R4 w - - 0 1)

Isaev, Leonid Antonovich

3rd Prize, Tijdschrift vd NSB, 1928

5K2/1N1p4/5p2/Q1N5/P2k1BR1/q2P1B2/1pn5/3R4

#2

10 + 6

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5+
      • 2.Qxc5#
    • 1...Qa1
      • 2.Sb3#
    • 1...Qb3
      • 2.Sxb3#
    • 1...d6
      • 2.Se6#
  • Tries
    • 1.Qc3+?
      • 1...Kxc3
        • 2.Bd2#
      • 1...Qxc3!
    • 1.Qa6?
      • threat
        • 2.Qc4#
        • 2.Qxf6#
      • 1...Kc3
        • 2.Bd2#
        • 2.Qc4#
      • 1...Qxd3
        • 2.Rxd3#
        • 2.Qxd3#
      • 1...Qxa4
        • 2.Qxf6#
      • 1...Se3
        • 2.Qxf6#
      • 1...Qb4
        • 2.Qxf6#
      • 1...Qa2
        • 2.Qxf6#
      • 1...Qb3
        • 2.Qxf6#
      • 1...Qc3
        • 2.Qd6#
        • 2.Qxf6#
      • 1...f5
        • 2.Qc4#
        • 2.Qf6#
      • 1...d5
        • 2.Qxf6#
      • 1...d6
        • 2.Qc4#
      • 1...Qxc5+!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Bd2#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...Kc3
        • 2.Bd2#
      • 1...Qxd3
        • 2.Sb3#
      • 1...Se3
        • 2.Be5#
      • 1...f5
        • 2.Qe5#
      • 1...d6
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(c);CHECK,OGATE,XS(H)::QAB1(G),XQ(c)
    • Q(c);N_PINS(H)::S(H)
    • Q(c);N_PINS(H)::S(H),XQ(c)
    • P(f);N_PINS(H)::S(H)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);S_FLIGHT,XQ(G)::B(E)
      • Refutation
        • Q(c);N_PINS(H),XQ(G)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);N_PINS(H),XP(D)::QAB(G),XP(e)
        • S(b);::QAB(G),XP(e)
        • Q(c);::QAB(G),XP(e)
        • Q(c);N_PINS(H)::QAB(G),XP(e)
        • P(f);::QAB(G),XP(e)
        • P(f);N_PINS(H)::QAR1(G)
      • Refutation
        • Q(c);CHECK,XS(H)
  • Actual
    • Q(G);
    • Threat
      • R(F)+B(E)
    • Vars
      • Q(c);CHECK,OGATE,XS(H)::QAB1(G),XQ(c)
      • K(d);S_FLIGHT::B(E)
      • Q(c);N_PINS(H),P_SPINQ(c),XP(B)::S(H)
      • S(b);SBLOCK::R(F)+B(E),DCHECK
      • P(e);N_GUARD::QAB1(G)
      • P(f);N_PINS(H)::S(H)
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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).