MESON Chess Problem Database

Problem Display
PID: 138938 (8/Q7/2K1p3/4P3/PkBBRN2/r3N3/pq6/1Rn5 w - - 0 1)

Viksna, Kristaps

Die Schwalbe, 1965

8/Q7/2K1p3/4P3/PkBBRN2/r3N3/pq6/1Rn5

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Bc5#
    • 1...Rxa4
      • 2.Qc5#
    • 1...Sb3
      • 2.Sd3#
  • Tries
    • 1.Rxb2+?
      • 1...Sb3
        • 2.Sd3#
      • 1...Rb3!
  • Keys
    • 1.Bb3!
      • threat
        • 2.Qb6#
      • 1...Qc3+
        • 2.Bc5#
      • 1...Qc2+
        • 2.Sxc2#
      • 1...Kxb3
        • 2.Rxb2#
      • 1...Qxd4
        • 2.Qc5#
      • 1...Qxb3
        • 2.Ba1#
      • 1...Rxb3
        • 2.Bxb2#
      • 1...Rxa4
        • 2.Qxa4#
      • 1...Sxb3
        • 2.Sd3#
      • 1...Qe2
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • R(d);P_PINB(D),SBLOCK::B(E)
    • R(d);SBLOCK,XP(C)::QAB1(J)
    • S(a);N_GUARD,N_SPINQ(c),S_CUTR(d)::S(G)
  • Tries
    • Try
      • R(A);CHECK,XQ(c)
      • Vars
        • S(a);P_SPINS(a)::S(G)
      • Refutation
        • R(d);P_SPINR(d)
  • Actual
    • B(D);N_PINQ(c)
    • Threat
      • QAR2(J)
    • Vars
      • Q(c);CHECK,SBLOCK::R(F)+B(E),DCHECK
      • Q(c);CHECK,N_GUARD::S(B),XQ(c)
      • K(e);OGATEB,P-FLIGHT,P_SPINQ(c),XB(D)::R1(A),XQ(c)
      • Q(c);P_SPINQ(c),XB(E)::QAB1(J)
      • Q(c);OGATE,P_SPINQ(c),XB(D)::R(F)+B(E)
      • R(d);SBLOCK,XB(D)::R(F)+B(E),XQ(c)
      • R(d);OGATE,XP(C)::QAR1(J),XR(d)
      • S(a);N_GUARD,SBLOCK,XB(D)::S(G)
      • Q(c);::QAB1(J)
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