MESON Chess Problem Database

Problem Display
PID: 258745 (8/B7/3RR3/1NnPN3/4k1PK/1r2P1p1/p3P3/1b2Q1n1 w - - 0 1)

Makaronets, Leonid

4th Prize, Buletin Problemistic, 1987

8/B7/3RR3/1NnPN3/4k1PK/1r2P1p1/p3P3/1b2Q1n1

#2

11 + 7

15601 Albrecht-Leiss-Degener Collection 2022
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe3
      • 2.Sd3#
    • 1...Rxe3
      • 2.Qb4#
    • 1...Sf3+
      • 2.exf3#
    • 1...Sd3
      • 2.Sxd3#
    • 1...Sa4
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
      • 2.Sf7#
    • 1...Sa6
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
      • 2.Sf7#
    • 1...Sb7
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
      • 2.Sf7#
    • 1...Sd7
      • 2.Sxd7#
  • Tries
    • 1.Qf2?
      • threat
        • 2.Qf4#
      • 1...Sf3+
        • 2.Qxf3#
        • 2.exf3#
      • 1...Rxe3
        • 2.Qf5#
      • 1...Sxe2
        • 2.Qf3#
      • 1...Sxe6
        • 2.Qf5#
      • 1...Sh3
        • 2.Qf3#
      • 1...Sd3
        • 2.Sxd3#
        • 2.Qf5#
      • 1...gxf2!
    • 1.Qb4+?
      • 1...Kxe3
        • 2.Sd3#
      • 1...Rxb4!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qf4#
      • 1...Sf3+
        • 2.Qxf3#
      • 1...Kxe3
        • 2.Sc4#
      • 1...Rxe3
        • 2.Qf5#
      • 1...Sxe2
        • 2.Qf3#
      • 1...Sxe6
        • 2.Qf5#
      • 1...Sh3
        • 2.Qf3#
      • 1...Sd3
        • 2.Sxd3#
        • 2.Qf5#

Anticipated by 85184(1984)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(f);P-FLIGHT,P_SPINS(g),XP(C)::R(J)+S(H)
    • R(d);N_GUARD,SBLOCK,XP(C)::QAR(A)
    • S(b);CHECK,OGATE::P(B),XS(b)
    • S(g);N_GUARD::R(J)+S(H),XS(g)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • R(d);SBLOCK,XP(C)::QAB1(A)
        • S(b);N_GUARD,XP(B)::QAB1(A)
        • S(g);XR(J)::QAB1(A)
        • S(b);N_GUARD::QAB1(A)
      • Refutation
        • P(e);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);P-FLIGHT,P_SPINS(g),XP(C)::R(J)+S(H)
      • Refutation
        • R(d);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • S(b);CHECK,N_GUARD::QAB1(A),XS(b)
      • K(f);P-FLIGHT,P_SPINS(g),XP(C)::R(J)+S(H),DCHECK
      • R(d);SBLOCK,XP(C)::QAB1(A)
      • S(b);N_GUARD,XP(B)::QAB1(A)
      • S(g);XR(J)::QAB1(A)
      • S(b);N_GUARD::QAB1(A)
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