MESON Chess Problem Database

Problem Display
PID: 267043 (4RQ2/1b3n1r/7p/1p5K/5kpN/4n3/5P2/8 w - - 0 1)

Castellari, Umberto

South African Chess Player, 1958

4RQ2/1b3n1r/7p/1p5K/5kpN/4n3/5P2/8

#2

5 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.fxe3#
  • Tries
    • 1.Qa3?
      • threat
        • 2.Qxe3#
      • 1...Sd1
        • 2.Qg3#
      • 1...Sc2
        • 2.Qg3#
      • 1...Sg2
        • 2.Qg3#
      • 1...Sc4
        • 2.Qg3#
      • 1...Sd5
        • 2.Qg3#
      • 1...Sf5
        • 2.Sg6#
      • 1...Sf1!
    • 1.Qb4+?
      • 1...Be4
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Sc4!
    • 1.Qd6+?
      • 1...Se5
        • 2.Qxe5#
      • 1...Sxd6!
    • 1.Qe7?
      • threat
        • 2.Qxe3#
      • 1...Se5
        • 2.Qxe5#
      • 1...Be4
        • 2.Qxe4#
      • 1...Sd1
        • 2.Qf6#
      • 1...Sf1
        • 2.Qf6#
      • 1...Sc2
        • 2.Qf6#
      • 1...Sg2
        • 2.Qf6#
      • 1...Sc4
        • 2.Qf6#
      • 1...Sd5
        • 2.Qe4#
      • 1...Sf5!
    • 1.Qxf7+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Rxf7!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxe3#
      • 1...Sd1
        • 2.Qf5#
      • 1...Sf1
        • 2.Qf5#
      • 1...Sc2
        • 2.Qf5#
      • 1...Sg2
        • 2.Qf5#
      • 1...Sc4
        • 2.Qf5#
      • 1...Sd5
        • 2.Qd4#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • P(c);SBLOCK::P(A),XS(a)
  • Tries
    • Try
      • Q(E);N_PINS(g)
      • Threat
        • QAB1(E),XS(a)
      • Vars
        • S(a);OGATE::QAB1(E)
        • S(a);SBLOCK::S(B)
      • Refutation
        • S(a);
    • Try
      • Q(E);CHECK,N_PINS(g)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(E);CHECK,N_PINS(g)
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(E),XS(g)
      • Refutation
        • S(g);XQ(E)
    • Try
      • Q(E);N_PINS(g)
      • Threat
        • QAB1(E),XS(a)
      • Vars
        • S(g);N_GUARD::QAB1(E),XS(g)
        • B(f);N_GUARD::QAR1(E),XB(f)
        • S(a);N_GUARD::QAR2(E)
        • S(a);S_CUTB(f)::QAR1(E)
      • Refutation
        • S(a);
    • Try
      • Q(E);CHECK,XS(g)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(E),XS(a)
      • Refutation
        • R(h);XQ(E)
  • Actual
    • Q(E);N_PINS(g)
    • Threat
      • QAB1(E),XS(a)
    • Vars
      • S(a);N_GUARD::QAR1(E)
      • S(a);S_CUTB(f)::QAR2(E)
      • S(a);N_GUARD::QAR1(E),XS(a)
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