MESON Chess Problem Database

Problem Display
PID: 287248 (4r3/pP1R3q/2PN3p/R1PN1P2/3kp1P1/PBprp1B1/3p4/K2Q4 w - - 0 1)

Lobusov, Andrey Jakovlevic

Comm., 64 Shakhmatnoe obozrenie, 1985

4r3/pP1R3q/2PN3p/R1PN1P2/3kp1P1/PBprp1B1/3p4/K2Q4

#2

14 + 10

15601 Albrecht-Leiss-Degener Collection 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5
      • 2.Sxf5#
  • Tries
    • 1.Sxc3?
      • threat
        • 2.Se2#
      • 1...Kxc3
        • 2.Sb5#
      • 1...Rxc3
        • 2.Sf7#
      • 1...e2!
    • 1.Sxe3?
      • threat
        • 2.Sc2#
      • 1...Kxe3
        • 2.Sc4#
      • 1...Rxe3
        • 2.Sf7#
      • 1...c2!
    • 1.Sb4?
      • threat
        • 2.Sc2#
        • 2.Sf7#
      • 1...Qxf5
        • 2.Sc2#
        • 2.Sxf5#
      • 1...Qxd7
        • 2.Sc2#
      • 1...e2
        • 2.Sc2#
      • 1...Qg6
        • 2.Sc2#
      • 1...Qe7
        • 2.Sc2#
      • 1...Qf7
        • 2.Sc2#
        • 2.Sxf7#
      • 1...Re5
        • 2.Sc2#
      • 1...Re6
        • 2.Sc2#
      • 1...Re7
        • 2.Sc2#
      • 1...Rd8
        • 2.Sc2#
      • 1...c2!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Ra4#
      • 1...Kxe4
        • 2.Sf6#
      • 1...Rxe4
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(i);XP(J)::S(L),XQ(i)
  • Tries
    • Try
      • S(I);XP(b)
      • Threat
        • S(I)
      • Vars
        • K(e);N_GUARD,S_FLIGHT,XS(I)::S(L)
        • R(c);P_SPINP(a),SBLOCK,XS(I)::R(N)+S(L)
      • Refutation
        • P(d);
    • Try
      • S(I);XP(d)
      • Threat
        • S(I)
      • Vars
        • K(e);S_CUTQ(i),S_FLIGHT,XS(I)::S(L)
        • R(c);P_SPINP(a),SBLOCK,XS(I)::R(N)+S(L)
      • Refutation
        • P(b);
    • Try
      • S(I);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);XR(N)::S(I)
        • P(d);::S(I)
        • Q(i);::S(I)
        • R(j);::S(I)
      • Refutation
        • P(b);
  • Actual
    • S(L);XP(f)
    • Threat
      • R(G)
    • Vars
      • K(e);P-FLIGHT,S_CUTQ(i),XS(L)::S(I)
      • R(j);SBLOCK,XS(L)::R(N)+S(I)
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