MESON Chess Problem Database

Problem Display
PID: 271343 (1N2n1K1/qp1Q1pp1/P4b2/P1kB4/3p4/Pp4r1/2NR1n1B/2R1r3 w - - 0 1)

Lamba, Stelian

Buletin Problemistic, 1992

1N2n1K1/qp1Q1pp1/P4b2/P1kB4/3p4/Pp4r1/2NR1n1B/2R1r3

#2

11 + 12

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Re2
      • 2.Se3#
    • 1...Ree3
      • 2.Sxe3#
    • 1...Re4
      • 2.Se3#
    • 1...Re5
      • 2.Se3#
    • 1...Re6
      • 2.Se3#
    • 1...Re7
      • 2.Se3#
    • 1...Rg1
      • 2.Sxe1#
    • 1...Rg2
      • 2.Sxe1#
    • 1...Rg4
      • 2.Sxe1#
    • 1...Rg5
      • 2.Sxe1#
    • 1...Rg6
      • 2.Sxe1#
    • 1...bxa6
      • 2.Qc6#
    • 1...b5
      • 2.Qc6#
    • 1...b6
      • 2.Qc6#
  • Tries
    • 1.Sa1+?
      • 1...Rc3
        • 2.Sxb3#
      • 1...Rxc1!
    • 1.Sxd4+?
      • 1...Rc3
        • 2.Sxb3#
        • 2.Rxc3#
        • 2.Qb5#
      • 1...Rxc1!
    • 1.Bxb7?
      • threat
        • 2.Qc6#
        • 2.Qd5#
      • 1...Kc4
        • 2.Se3#
      • 1...Qxa6
        • 2.Qd5#
      • 1...Sd6
        • 2.Qc6#
      • 1...Qb6
        • 2.Qd5#
      • 1...Re5
        • 2.Se3#
        • 2.Qc6#
      • 1...Re6
        • 2.Se3#
        • 2.Qd5#
      • 1...Rg5
        • 2.Sxe1#
        • 2.Qc6#
      • 1...Sc7
        • 2.Qc6#
      • 1...Qxb7!
  • Keys
    • 1.Bc4!
      • threat
        • 2.Qd5#
      • 1...Kxc4
        • 2.Se3#
      • 1...Re5
        • 2.Qxd4#
      • 1...Rg5
        • 2.Qb5#
      • 1...Sd6
        • 2.Qc7#
      • 1...Sc7
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • R(a);N_GUARD::R(A)+S(B)
    • R(a);N_GUARD::R(A)+S(B),XR(a)
    • R(d);N_GUARD::R(A)+S(B),XR(a)
    • P(i);N_GUARD,XP(H)::QAR1(I)
    • P(i);N_GUARD::QAR1(I)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • R(d);P_SPINR(d)::S(B),XP(c)
      • Refutation
        • R(a);XR(A)
    • Try
      • S(B);CHECK,XP(e)
      • Refutation
        • R(a);XR(A)
    • Try
      • B(G);XP(i)
      • Threat
        • DUALS(2)
      • Vars
        • K(f);P-FLIGHT::R(A)+S(B),DCHECK
        • Q(h);XP(H)::QAR1(I)
        • S(l);::QAR1(I)
        • Q(h);::QAR1(I)
      • Refutation
        • Q(h);XB(G)
  • Actual
    • B(G);
    • Threat
      • QAR1(I)
    • Vars
      • K(f);P-FLIGHT,XB(G)::R(A)+S(B),DCHECK
      • R(a);S_CUTB(g)::QAB1(I),XP(e)
      • R(d);::QAR1(I)
      • S(l);N_GUARD::QAR2(I)
      • S(l);N_GUARD::QAR2(I),XS(l)
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