MESON Chess Problem Database

Problem Display
PID: 119953 (b7/3K4/2p5/3pN1p1/3k4/1PR1RP2/7Q/1nn5 w - - 0 1)

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

Novoye Vremya, 1908

b7/3K4/2p5/3pN1p1/3k4/1PR1RP2/7Q/1nn5

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Red3#
    • 1...Se2
      • 2.Red3#
    • 1...Sxb3
      • 2.Red3#
    • 1...Sd3
      • 2.Rexd3#
    • 1...g4
      • 2.Qf4#
  • Tries
    • 1.Sg4?
      • threat
        • 2.Qe5#
        • 2.Qh8#
      • 1...Sd3
        • 2.Rexd3#
      • 1...Sxc3!
    • 1.Sg6?
      • threat
        • 2.Qe5#
        • 2.Qh8#
      • 1...Sd3
        • 2.Rexd3#
      • 1...Sxc3!
    • 1.Sf7?
      • threat
        • 2.Qe5#
        • 2.Qh8#
      • 1...Sd3
        • 2.Rexd3#
      • 1...Sxc3!
    • 1.Qd2+?
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sxd2!
    • 1.Qh4+?
      • 1...g4
        • 2.Qxg4#
      • 1...gxh4!
    • 1.Qh8?
      • threat
        • 2.Sg4#
        • 2.Sxc6#
        • 2.Sg6#
        • 2.Sf7#
      • 1...Sd3
        • 2.Rexd3#
      • 1...g4
        • 2.Sxg4#
        • 2.Sxc6#
        • 2.Sg6#
        • 2.Sf7#
      • 1...c5
        • 2.Sc4#
        • 2.Sg4#
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sf7#
      • 1...Sxc3!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qe5#
      • 1...Kxc3
        • 2.Qb2#
      • 1...Kxe3
        • 2.Qf2#
      • 1...Sxd3
        • 2.Rexd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::R1(D)
    • S(b);N_GUARD,XP(B)::R1(D)
    • S(b);N_GUARD::R1(D),XS(b)
    • P(e);N_GUARD::QAR2(A)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD::R1(D),XS(b)
      • Refutation
        • S(a);XR(C)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD::R1(D),XS(b)
      • Refutation
        • S(a);XR(C)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD::R1(D),XS(b)
      • Refutation
        • S(a);XR(C)
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(A),XS(b)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAR(A),XP(e)
      • Refutation
        • P(e);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(b);N_GUARD::R1(D),XS(b)
      • Refutation
        • S(a);XR(C)
  • Actual
    • S(F);
    • Threat
      • QAB1(A)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XR(C)::QAB1(A)
      • K(c);OGATEB,S_FLIGHT,XR(D)::QAB1(A)
      • S(b);OGATE,XS(F)::R1(D),XS(b)
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