MESON Chess Problem Database

Problem Display
PID: 179708 (7B/Kp5B/4N3/p1P4p/N1kPP3/P4p1r/P5r1/nQ6 w - - 0 1)

Kopnin, Aleksey Grigorevich

3rd HM., Troitzky MT, 1986

7B/Kp5B/4N3/p1P4p/N1kPP3/P4p1r/P5r1/nQ6

#2

11 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rgg3
      • 2.Qf1#
    • 1...Rg4
      • 2.Qf1#
    • 1...Rg5
      • 2.Qf1#
    • 1...Rg6
      • 2.Qf1#
    • 1...Rg7
      • 2.Qf1#
    • 1...Rg8
      • 2.Qf1#
    • 1...Sc2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Qb5#
      • 1...Sb3
        • 2.Qxb3#
        • 2.axb3#
      • 1...Rb2+!
    • 1.Sf4?
      • threat
        • 2.Qd3#
      • 1...Rc2
        • 2.Bg8#
      • 1...Rd2
        • 2.Bg8#
      • 1...Sc2
        • 2.Qb3#
      • 1...f2!
    • 1.Sc7?
      • threat
        • 2.Qb5#
      • 1...Rb2
        • 2.Bg8#
      • 1...Sb3
        • 2.Qxb3#
        • 2.axb3#
      • 1...b5
        • 2.Qxb5#
      • 1...Rg7!
  • Keys
    • 1.Bg8!
      • threat
        • 2.Sg5#
      • 1...Rxg8
        • 2.Qf1#
      • 1...Rb2
        • 2.Sc7#
      • 1...Rc2
        • 2.Sf4#
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Rg5
        • 2.Sxg5#
        • 2.Qf1#
      • 1...Rg6
        • 2.Qf1#
      • 1...Rg7
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(b);N_GUARD::QAB(A)
    • S(a);N_GUARD::QAB1(A)
    • S(a);N_GUARD::QAB1(A),XS(a)
  • Tries
    • Try
      • K(I);S_FLIGHT
      • Threat
        • QAB1(A)
      • Refutation
        • R(b);CHECK
    • Try
      • S(H);
      • Threat
        • QAB1(A)
      • Vars
        • R(b);N_GUARD::B(J)
        • S(a);N_GUARD::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • S(H);
      • Threat
        • QAB1(A)
      • Vars
        • R(b);N_GUARD::B(J)
        • P(h);::QAB1(A),XP(h)
      • Refutation
        • R(b);
  • Actual
    • B(J);
    • Threat
      • B(J)+S(H)
    • Vars
      • R(b);N_GUARD,XB(J)::QAB(A)
      • R(b);N_GUARD::B(J)+S(H)
      • S(a);N_GUARD::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • R(b);N_GUARD::QAB(A)
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