MESON Chess Problem Database

Problem Display
PID: 271142 (6B1/8/8/n1B2R2/6q1/2k1P3/nNP5/1K3N2 w - - 0 1)

Retter, Yosef

2nd Comm., Pat a Mat, 1991

6B1/8/8/n1B2R2/6q1/2k1P3/nNP5/1K3N2

#2

8 + 4

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1+
      • 2.Sxd1#
    • 1...Qe2
      • 2.Sa4#
    • 1...Qf3
      • 2.Sa4#
    • 1...Qh3
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qxf5
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qh5
      • 2.Sa4#
    • 1...Qg1
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qg2
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qg3
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qa4
      • 2.Sd1#
      • 2.Sxa4#
    • 1...Qc4
      • 2.Sd1#
    • 1...Qe4
      • 2.Sd1#
    • 1...Qf4
      • 2.Sd1#
    • 1...Qh4
      • 2.Sd1#
    • 1...Qg5
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qg6
      • 2.Sd1#
      • 2.Sa4#
    • 1...Qg7
      • 2.Sd1#
      • 2.Sa4#
    • 1...Sb4
      • 2.Sa4#
    • 1...Sc4
      • 2.Sa4#
  • Tries
    • 1.Rf3?
      • threat
        • 2.Sd1#
      • 1...Qxf3
        • 2.Sa4#
      • 1...Qxg8
        • 2.e4#
      • 1...Qb4
        • 2.e4#
      • 1...Qe6
        • 2.e4#
      • 1...Qd4
        • 2.exd4#
      • 1...Qd7!
    • 1.Rf4?
      • threat
        • 2.Sa4#
      • 1...Qd1+
        • 2.Sxd1#
      • 1...Qxf4
        • 2.Sd1#
      • 1...Qd7!
  • Keys
    • 1.e4!
      • threat
        • 2.Sa4#
      • 1...Qd1+
        • 2.Sxd1#
      • 1...Qxe4
        • 2.Sd1#
      • 1...Qxg8
        • 2.Rf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(c);CHECK,N_GUARD::S(C),XQ(c)
    • Q(c);N_GUARD::S(C)
    • Q(c);N_GUARD,P_PINP(D)::S(C)
    • S(a);S_CUTQ(c)::S(C)
    • S(d);S_CUTQ(c)::S(C)
  • Tries
    • Try
      • R(G);
      • Threat
        • S(C)
      • Vars
        • Q(c);N_GUARD,XR(G)::S(C)
        • Q(c);N_GUARD,XB(H)::R(G)+P(E)
        • Q(c);N_GUARD,P_PINS(C)::R(G)+P(E)
        • Q(c);N_GUARD::R(G)+P(E)
        • Q(c);OGATE::R(G)+P(E),XQ(c)
      • Refutation
        • Q(c);
    • Try
      • R(G);
      • Threat
        • S(C)
      • Vars
        • Q(c);CHECK,N_GUARD::S(C),XQ(c)
        • Q(c);N_GUARD,XR(G)::S(C)
      • Refutation
        • Q(c);
  • Actual
    • P(E);
    • Threat
      • S(C)
    • Vars
      • Q(c);CHECK,N_GUARD::S(C),XQ(c)
      • Q(c);N_GUARD,P_PINP(D),XP(E)::S(C)
      • Q(c);N_GUARD,XB(H)::R(G)
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