MESON Chess Problem Database

Problem Display
PID: 259620 (4B3/1p1R4/r1k5/p1q5/8/N7/4KB2/2R3b1 w - - 0 1)

Leites, Samuil Davidovich

Pravda Vostoka, 1949

(First published on Sat Sep 3 1949)

4B3/1p1R4/r1k5/p1q5/8/N7/4KB2/2R3b1

#2

6 + 6

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2+
      • 2.Rxc2#
    • 1...Qc3
      • 2.Rxc3#
    • 1...Qc4+
      • 2.Rxc4#
    • 1...Rb6
      • 2.Rxc5#
  • Tries
    • 1.Bxc5?
      • threat
        • 2.Bxg1#
        • 2.Bf2#
        • 2.Be3#
        • 2.Bd4#
      • 1...Bf2
        • 2.Bxf2#
        • 2.Be3#
        • 2.Bd4#
      • 1...Bh2
        • 2.Bg1#
        • 2.Bf2#
        • 2.Be3#
        • 2.Bd4#
        • 2.Ba7#
      • 1...Be3
        • 2.Bxe3#
      • 1...Bd4
        • 2.Bxd4#
      • 1...Bxc5!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Rd6#
      • 1...Qc2+
        • 2.Rd2#
      • 1...Qc4+
        • 2.Rd3#
      • 1...Kxb5
        • 2.Rxb7#
      • 1...Kb6
        • 2.Rd6#
      • 1...b6
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(c);CHECK,OGATEB::R(A),XQ(c)
    • Q(c);OGATEB::R(A),XQ(c)
    • R(d);SBLOCK::R1(A),XQ(c)
  • Tries
    • Try
      • B(C);XQ(c)
      • Threat
        • DUALS(4)
      • Vars
        • B(a);::R(A)+B(C),XB(a)
      • Refutation
        • B(a);P_SPINB(a),XB(C)
  • Actual
    • S(D);
    • Threat
      • B(F)+R(E),DCHECK
    • Vars
      • Q(c);CHECK::B(F)+R(E)
      • K(e);N_GUARD,N_SPINQ(c),S_FLIGHT,XS(D)::B(F)+R(E),DCHECK,XP(f)
      • K(e);P-FLIGHT::R(E)
      • P(f);SBLOCK::S(D)
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