MESON Chess Problem Database

Problem Display
PID: 221607 (Q7/2n5/2KNP3/1pp1pB2/3k1N2/3P2nR/1r2pP2/4B3 w - - 0 1)

Erokhin, Vladimir Alekseevich

Suomen Shakki, 1979

Q7/2n5/2KNP3/1pp1pB2/3k1N2/3P2nR/1r2pP2/4B3

#2

10 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf5
      • 2.Sxf5#
    • 1...Sxe6
      • 2.Sxe6#
    • 1...c4
      • 2.Qa7#
    • 1...exf4
      • 2.Qh8#
    • 1...e4
      • 2.Qh8#
  • Tries
    • 1.Kxc7?
      • threat
        • 2.Qd5#
      • 1...Rd2
        • 2.Sxb5#
      • 1...exf4!
    • 1.Rh4?
      • threat
        • 2.Sxe2#
      • 1...Sxf5
        • 2.Sxf5#
      • 1...exf4
        • 2.Qh8#
      • 1...e4
        • 2.Qh8#
      • 1...Se4!
    • 1.Qd8?
      • threat
        • 2.Sxb5#
      • 1...exf4
        • 2.Qf6#
        • 2.Qh8#
      • 1...e4
        • 2.Qf6#
        • 2.Qh8#
      • 1...b4
        • 2.Sb5#
      • 1...Sd5!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxb2#
      • 1...Se4
        • 2.Sxe2#
      • 1...Sd5
        • 2.Sxb5#
      • 1...c4
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(c);XB(F)::S(H),XS(c)
    • S(h);XP(I)::S(E),XS(h)
    • P(f);OGATEB::QAB(J)
    • P(g);OGATEB,XS(E)::QAB(J)
    • P(g);OGATEB::QAB(J)
  • Tries
    • Try
      • K(G);P-FLIGHT,XS(h)
      • Threat
        • QAR1(J)
      • Vars
        • R(a);N_GUARD::S(H),XP(e)
      • Refutation
        • P(g);XS(E)
    • Try
      • R(D);
      • Threat
        • R(D)+S(E),DCHECK,XP(b)
      • Vars
        • S(c);XB(F)::S(H),XS(c)
        • P(g);OGATEB,P_SPINP(g),XS(E)::QAB(J)
        • P(g);OGATEB::QAB(J)
      • Refutation
        • S(c);
    • Try
      • Q(J);
      • Threat
        • QAR(J)+S(H),DCHECK,XP(e)
      • Vars
        • P(e);::QAR(J)+S(H),DCHECK
      • Refutation
        • S(h);
  • Actual
    • Q(J);P_PINR(a)
    • Threat
      • QAB(J),XR(a)
    • Vars
      • S(c);N_GUARD::S(E),XP(b)
      • S(h);N_GUARD::S(H),XP(e)
      • P(f);OGATEB::QAB(J)
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