MESON Chess Problem Database

Problem Display
PID: 239610 (K5B1/R7/1b1B4/NP1r4/k7/Nn2Rn1Q/1PP5/3q4 w - - 0 1)

Maleika, Gerhard

L'Italia Scacchistica, 1991

K5B1/R7/1b1B4/NP1r4/k7/Nn2Rn1Q/1PP5/3q4

#2

11 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.cxb3#
    • 1...Qa1
      • 2.cxb3#
    • 1...Qb1
      • 2.cxb3#
    • 1...Qc1
      • 2.cxb3#
    • 1...Qe1
      • 2.cxb3#
    • 1...Qf1
      • 2.cxb3#
    • 1...Qg1
      • 2.cxb3#
    • 1...Qh1
      • 2.cxb3#
    • 1...Qd2
      • 2.cxb3#
    • 1...Qd4
      • 2.cxb3#
    • 1...Rd2
      • 2.Bxb3#
    • 1...Rd4
      • 2.Bxb3#
    • 1...Re5
      • 2.Bxb3#
    • 1...Rf5
      • 2.Bxb3#
    • 1...Rg5
      • 2.Bxb3#
    • 1...Rh5
      • 2.Bxb3#
    • 1...Sxa5
      • 2.b3#
  • Tries
    • 1.Sxb3+?
      • 1...Ba5
        • 2.Rxa5#
      • 1...Bxa7!
    • 1.S5c4+?
      • 1...Ba5
        • 2.Sb6#
      • 1...Sa5
        • 2.Sxb6#
        • 2.b3#
      • 1...Bxa7!
    • 1.Qg4+?
      • 1...Qd4
        • 2.cxb3#
      • 1...Rd4
        • 2.Bxb3#
      • 1...Bd4
        • 2.Sxb3#
      • 1...Sbd4
        • 2.b3#
      • 1...Sfd4!
  • Keys
    • 1.Re4+!
      • 1...Qd4
        • 2.cxb3#
      • 1...Rd4
        • 2.Bxb3#
      • 1...Bd4
        • 2.Sxb3#
      • 1...Sbd4
        • 2.b3#
      • 1...Sfd4
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 15
  • Sets
    • Q(a);N_GUARD::P(B),XS(b)
    • R(e);OGATE::B(K),XS(b)
    • S(b);OGATE,P_SPINS(b),XS(F)::P(A)
  • Tries
    • Try
      • S(F);CHECK,XS(b)
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::R1(I),XB(f)
      • Refutation
        • B(f);XR(I)
    • Try
      • S(F);CHECK
      • Vars
        • B(f);P_SPINB(f)::S(F)
      • Refutation
        • B(f);XR(I)
    • Try
      • Q(E);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::P(B),XS(b)
        • R(e);OGATE,P_SPINR(e)::B(K),XS(b)
        • B(f);P_SPINB(f)::R(I)+S(F),XS(b)
        • S(b);OGATE,P_SPINS(b)::P(A)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • R(D);CHECK
    • Vars
      • Q(a);P_SPINQ(a)::P(B),XS(b)
      • R(e);OGATE,P_SPINR(e)::B(K),XS(b)
      • B(f);P_SPINB(f)::R(I)+S(F),XS(b)
      • S(b);OGATE,P_SPINS(b)::P(A)
      • S(c);OGATE,P_SPINS(c)::QAB1(E),XS(b)
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