MESON Chess Problem Database

Problem Display
PID: 252940 (8/K7/8/2Q2N1B/6R1/3N4/3BkpPp/3n2br w - - 0 1)

Keirans, Peteris

Raganis, A

Die Schwalbe, 1930

8/K7/8/2Q2N1B/6R1/3N4/3BkpPp/3n2br

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd3
      • 2.Rd4#
  • Tries
    • 1.Sc1+?
      • 1...Kf1
        • 2.Qc4#
        • 2.Qb5#
      • 1...Kxd2!
    • 1.Sf4+?
      • 1...Kf1
        • 2.Sg3#
        • 2.Qc4#
        • 2.Qb5#
      • 1...Kxd2!
    • 1.Sg3+?
      • 1...Kxd3
        • 2.Rd4#
      • 1...Kxd2!
    • 1.Rg3+?
      • 1...Kxd2
        • 2.Qc1#
      • 1...Kf1!
    • 1.Rd4+?
      • 1...Kxd2
        • 2.Qc1#
      • 1...Kf1!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Sg3#
      • 1...f1Q+
        • 2.Be3#
      • 1...f1S+
        • 2.Rd4#
      • 1...f1B+
        • 2.Be3#
        • 2.Rd4#
      • 1...f1R+
        • 2.Be3#
      • 1...Kf1
        • 2.Qxd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(d);N_GUARD,S_FLIGHT,XS(C)::R1(D)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(d);P-FLIGHT,XB(A)
    • Try
      • S(C);CHECK
      • Refutation
        • K(d);P-FLIGHT,XB(A)
    • Try
      • S(F);CHECK
      • Vars
        • K(d);N_GUARD,S_FLIGHT,XS(C)::R1(D)
      • Refutation
        • K(d);P-FLIGHT,XB(A)
    • Try
      • R(D);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT,XB(A)::QAB1(E)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT,XB(A)::QAB1(E)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(E);
    • Threat
      • S(F)
    • Vars
      • P(e);CHECK,SBLOCK::QAR(E)+B(A)
      • P(e);CHECK,SBLOCK::B(G)+R(D)
      • K(d);N_GUARD,S_FLIGHT::QAR2(E),XS(a)
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