MESON Chess Problem Database

Problem Display
PID: 117117 (3R3r/b4p2/r7/3P1p2/2N1kp1Q/p1P5/2K3P1/8 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Illustrated Family Journal, 1909-1910

3R3r/b4p2/r7/3P1p2/2N1kp1Q/p1P5/2K3P1/8

#2

7 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Qe7#
    • 1...Ra5
      • 2.Qe7#
    • 1...Rb6
      • 2.Qe1#
    • 1...Bb6
      • 2.Qe7#
    • 1...Bb8
      • 2.Qe1#
  • Tries
    • 1.Sd2+?
      • 1...Ke3
        • 2.Qe1#
      • 1...Ke5!
    • 1.Qh3?
      • threat
        • 2.Qd3#
        • 2.Qf3#
      • 1...f3
        • 2.Qxf3#
      • 1...Be3
        • 2.Qf3#
      • 1...Rxh3!
    • 1.Qh5?
      • threat
        • 2.Qf3#
      • 1...f3
        • 2.Qxf3#
      • 1...Rxh5!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Qe1#
        • 2.Qe7#
      • 1...Ke3
        • 2.Qe1#
      • 1...Ke5
        • 2.Qe7#
      • 1...Rxb6
        • 2.Qe1#
      • 1...Rxh4
        • 2.Re8#
      • 1...Bxb6
        • 2.Qe7#
      • 1...Rh6
        • 2.Qe1#
      • 1...Re8
        • 2.Rxe8#
        • 2.Qe1#
      • 1...Bb8
        • 2.Qe1#
      • 1...f6
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(e);N_GUARD::QAR(E)
    • R(e);S_CUTB(f)::QAR(E)
    • B(f);S_CUTR(e)::QAR(E)
    • B(f);N_GUARD::QAR(E)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR2(E)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • Q(E);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAB1(E),XP(c)
        • B(f);::QAB1(E)
      • Refutation
        • R(h);XQ(E)
    • Try
      • Q(E);N_PINP(c)
      • Threat
        • QAB1(E)
      • Vars
        • P(c);::QAB1(E),XP(c)
      • Refutation
        • R(h);XQ(E)
  • Actual
    • S(D);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);N_SPINP(c),P-FLIGHT::QAR2(E)
      • R(e);XS(D)::QAR(E)
      • R(h);N_GUARD,N_SPINP(c),XQ(E)::R(G)
      • B(f);XS(D)::QAR(E)
      • R(h);::QAR(E)
      • B(f);::QAR(E)
      • P(g);::QAR(E)
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