MESON Chess Problem Database

Problem Display
PID: 285805 (K7/1Q4Pn/p3Nb2/r4k2/8/5NRP/1B3nq1/4R3 w - - 0 1)

Erokhin, Vladimir Alekseevich

Prace, 1977

(First published on Sat Apr 23 1977)

K7/1Q4Pn/p3Nb2/r4k2/8/5NRP/1B3nq1/4R3

#2

9 + 7

15601 Albrecht-Leiss-Degener Collection 2026
5454 Near Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf3
      • 2.Qxf3#
    • 1...Re5
      • 2.Sfd4#
    • 1...Bh4
      • 2.Sxh4#
    • 1...Bxg7
      • 2.Sh4#
    • 1...Sd1
      • 2.Qe4#
    • 1...Sh1
      • 2.Qe4#
    • 1...Sd3
      • 2.Qe4#
    • 1...Sxh3
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sg4
      • 2.Qe4#
    • 1...Sg5
      • 2.Sh4#
  • Tries
    • 1.Re5+?
      • 1...Rxe5
        • 2.Sfd4#
      • 1...Bxe5!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qg6#
      • 1...Qxf3+
        • 2.Rxf3#
      • 1...Qxg3
        • 2.Sfd4#
      • 1...Re5
        • 2.Rxe5#
      • 1...Se4
        • 2.Sh4#
      • 1...Sg4
        • 2.hxg4#
      • 1...Sg5
        • 2.Qxf6#
      • 1...Sf8
        • 2.Qxf6#

Anticipated by 241131(1976)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(b);OGATE,P_PINQ(G),XS(C)::QAR2(G),XQ(b)
    • R(c);S_CUTB(f)::S(C)
    • B(f);N_GUARD::S(C),XB(f)
    • B(f);N_GUARD,XP(H)::S(C)
    • S(a);N_GUARD::QAB1(G)
    • S(a);N_GUARD,XP(E)::QAB1(G)
    • S(a);N_GUARD::QAB1(G),XS(a)
    • S(g);S_CUTB(f)::S(C)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • R(c);SBLOCK,XR(A)::S(C)
      • Refutation
        • B(f);XR(A)
  • Actual
    • Q(G);P_PINB(f),P_SPINS(C)
    • Threat
      • QAB1(G)
    • Vars
      • Q(b);CHECK,OGATE,XS(C)::R(D),XQ(b)
      • Q(b);N_PINS(C),XR(D)::S(C)
      • R(c);N_GUARD::R1(A),XR(c)
      • S(a);N_PINS(C)::S(C)
      • S(a);OGATE::P(E),XS(a)
      • S(g);N_GUARD::QAR1(G),XB(f)
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