MESON Chess Problem Database

Problem Display
PID: 63469 (2B1K1Qn/3N3p/3PR2P/5k2/2P1pppP/6Pn/5P2/b7 w - - 0 1)

Gross, Erwin

2nd Prize, diagrammes, 1975

2B1K1Qn/3N3p/3PR2P/5k2/2P1pppP/6Pn/5P2/b7

#2

11 + 8

3771 FIDE Album (1974-1976) 1980

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Rxe5#
    • 1...Bf6
      • 2.Rxf6#
  • Tries
    • 1.Se5?
      • threat
        • 2.Qxg4#
      • 1...Bxe5
        • 2.Rg6#
      • 1...Sxf2
        • 2.Qg5#
      • 1...Sg5
        • 2.Qxg5#
      • 1...Sg6
        • 2.Qf7#
      • 1...e3!
    • 1.Sf6?
      • threat
        • 2.Qxg4#
      • 1...Bxf6
        • 2.Re7#
      • 1...Sxf2
        • 2.Qg5#
      • 1...Sg5
        • 2.Qxg5#
      • 1...Sg6!
    • 1.Re7?
      • threat
        • 2.Qe6#
      • 1...Bf6
        • 2.Sc5#
        • 2.Se5#
        • 2.Sb6#
        • 2.Sb8#
        • 2.Sf8#
      • 1...Sg5
        • 2.Qxg5#
      • 1...Sf7
        • 2.Qxh7#
      • 1...fxg3!
    • 1.Qf7+?
      • 1...Bf6
        • 2.Re5#
        • 2.Rxf6#
        • 2.Qxf6#
      • 1...Sxf7!
    • 1.Qxh7+?
      • 1...Sg6
        • 2.Qxg6#
      • 1...Kxe6!
    • 1.Qg5+?
      • 1...Kxe6
        • 2.Qd5#
      • 1...Sxg5!
  • Keys
    • 1.Rxe4!
      • threat
        • 2.Qe6#
      • 1...Kxe4
        • 2.Qd5#
      • 1...Be5
        • 2.Rxe5#
      • 1...Bf6
        • 2.Sc5#
      • 1...Sg5
        • 2.Rxf4#
      • 1...Sf7
        • 2.Qxh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::R1(F),XB(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAB1(K),XP(e)
      • Vars
        • B(a);SBLOCK,XS(H)::B(I)+R(F)
        • S(b);N_GUARD,XP(A)::QAR1(K)
        • S(b);N_GUARD::QAR1(K),XS(b)
        • S(h);N_GUARD::QAR2(K)
      • Refutation
        • P(c);
    • Try
      • S(H);
      • Threat
        • QAB1(K),XP(e)
      • Vars
        • B(a);SBLOCK,XS(H)::B(I)+R(F)
        • S(b);N_GUARD,XP(A)::QAR1(K)
        • S(b);N_GUARD::QAR1(K),XS(b)
      • Refutation
        • S(h);
    • Try
      • R(F);
      • Threat
        • QAB1(K)
      • Vars
        • S(b);N_GUARD::QAR1(K),XS(b)
        • S(h);N_GUARD::QAB(K),XP(g)
      • Refutation
        • P(d);XP(B)
    • Try
      • Q(K);CHECK
      • Refutation
        • S(h);XQ(K)
    • Try
      • Q(K);CHECK,XP(g)
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::QAB1(K),XS(h)
      • Refutation
        • K(f);S_FLIGHT,XR(F)
    • Try
      • Q(K);CHECK
      • Vars
        • K(f);OGATE,S_FLIGHT,XR(F)::QAB1(K)
      • Refutation
        • S(b);XQ(K)
  • Actual
    • R(F);XP(c)
    • Threat
      • QAB1(K)
    • Vars
      • K(f);S_FLIGHT,XR(F)::QAB1(K)
      • B(a);N_GUARD::R1(F),XB(a)
      • B(a);SBLOCK::B(I)+S(H)
      • S(b);N_GUARD::R1(F),XP(d)
      • S(h);N_GUARD::QAB(K),XP(g)
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