MESON Chess Problem Database

Problem Display
PID: 265923 (6n1/2K5/2RN1PN1/3kB3/p2p2Bp/p3r3/1b3Qpq/3n4 w - - 0 1)

Castellari, Umberto

2nd HM., Federacion Catalana de Ajedrez, 1953

6n1/2K5/2RN1PN1/3kB3/p2p2Bp/p3r3/1b3Qpq/3n4

#2

8 + 11

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Qxd4#
    • 1...Rf3
      • 2.Qxf3#
    • 1...Bc3
      • 2.Qa2#
  • Tries
    • 1.Se7+?
      • 1...Kxe5
        • 2.Rc5#
        • 2.Qf5#
      • 1...Sxe7!
    • 1.Qc2?
      • threat
        • 2.Rc5#
        • 2.Qc4#
        • 2.Qc5#
      • 1...Rc3
        • 2.Qe4#
      • 1...Bc3
        • 2.Qa2#
      • 1...Sc3!
    • 1.Qd2?
      • threat
        • 2.Qa5#
      • 1...Rc3
        • 2.Qxd4#
      • 1...Bc3
        • 2.Qa2#
      • 1...Sc3
        • 2.Qxd4#
      • 1...Rb3!
    • 1.Qxg2+?
      • 1...Rf3
        • 2.Qxf3#
      • 1...Re4
        • 2.Qxe4#
      • 1...Qxg2!
    • 1.Qf3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Rxf3!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qe6#
      • 1...Qxe5
        • 2.Sf4#
      • 1...Rxe5
        • 2.Bf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(f);OGATE,P_PINR(D)::QAR1(A),XP(h)
    • R(f);N_GUARD::QAB(A),XR(f)
    • B(b);OGATE::QAB(A)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • S(k);XS(G)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • R(f);N_GUARD,P_PINR(D)::QAB1(A)
        • B(b);OGATE::QAB(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);P_PINP(h)
      • Threat
        • QAR(A)
      • Vars
        • R(f);P_PINR(D),S_CUTB(b)::QAR1(A),XP(h)
        • B(b);OGATE::QAB(A)
        • S(a);S_CUTB(b)::QAR1(A),XP(h)
      • Refutation
        • R(f);
    • Try
      • Q(A);CHECK,XP(c)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB(A),XR(f)
        • R(f);N_GUARD,P_SPINR(f)::QAB1(A),XR(f)
      • Refutation
        • Q(d);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(A),XR(f)
      • Refutation
        • R(f);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(d);N_GUARD,P_PINS(E),P_SPINQ(d),XB(C)::S(G)
      • R(f);N_GUARD,P_SPINR(f),XB(C)::B(B)
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