MESON Chess Problem Database

Problem Display
PID: 259380 (3R4/8/4p3/3BknK1/8/r1r5/1Q6/2NR4 w - - 0 1)

Berg, Wolfgang

4th Prize, Scacchi e Scienze Applicate, 1986

3R4/8/4p3/3BknK1/8/r1r5/1Q6/2NR4

#2

6 + 5

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Qh2#
  • Tries
    • 1.Bc6?
      • threat
        • 2.Sd3#
      • 1...Sd4
        • 2.Qb8#
      • 1...Sd6!
    • 1.Qxc3+?
      • 1...Sd4
        • 2.Sd3#
        • 2.Re1#
        • 2.Qxd4#
        • 2.Qc7#
      • 1...Rxc3!
    • 1.Qe2+?
      • 1...Se3
        • 2.Qh2#
      • 1...Re3!
    • 1.Qh2+?
      • 1...Sg3
        • 2.Qh8#
      • 1...Rg3+!
    • 1.Qb8+?
      • 1...Sd6
        • 2.Qxd6#
      • 1...Rc7!
  • Keys
    • 1.Bf3!
      • threat
        • 2.Sd3#
      • 1...Sd4
        • 2.Qh2#
      • 1...Sd6
        • 2.Qh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(d);N_GUARD::QAB(C)
  • Tries
    • Try
      • B(D);
      • Threat
        • S(A)
      • Vars
        • S(d);N_GUARD,N_SPINR(b)::QAB(C)
      • Refutation
        • S(d);
    • Try
      • Q(C);CHECK,XR(b)
      • Refutation
        • R(a);XQ(C)
    • Try
      • Q(C);CHECK,N_PINR(b)
      • Vars
        • S(d);N_GUARD,P_SPINS(d),S_CUTR(b)::QAB(C)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • Q(C);CHECK,N_PINR(b)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB(C)
      • Refutation
        • R(b);CHECK,P_SPINR(b)
    • Try
      • Q(C);CHECK,N_PINR(b)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB1(C),XS(d)
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • B(D);
    • Threat
      • S(A)
    • Vars
      • S(d);N_GUARD,N_SPINR(b)::QAB(C)
      • S(d);N_GUARD::QAB(C)
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