MESON Chess Problem Database

Problem Display
PID: 187647 (5r2/4b1pq/2n5/7p/1pn1NN1k/7P/7K/2QR3b w - - 0 1)

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

Source?, 1909

5r2/4b1pq/2n5/7p/1pn1NN1k/7P/7K/2QR3b

#2

6 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Sxg6#
    • 1...Qg8
      • 2.Sg6#
    • 1...Qh8
      • 2.Sg6#
    • 1...Rxf4
      • 2.Qxf4#
    • 1...Bg2
      • 2.Sxg2#
  • Tries
    • 1.Rxh1?
      • threat
        • 2.Sg2#
        • 2.Qe1#
      • 1...Rxf4
        • 2.Qxf4#
      • 1...Qg6
        • 2.Sxg6#
      • 1...Bc5
        • 2.Sg2#
      • 1...Bd6
        • 2.Qe1#
      • 1...Se3
        • 2.Qe1#
      • 1...Qxe4!
    • 1.Rd5?
      • threat
        • 2.Qe1#
      • 1...Qxe4
        • 2.Rxh5#
      • 1...Rxf4
        • 2.Qxf4#
      • 1...Qg6
        • 2.Sxg6#
      • 1...Bc5!
    • 1.Qe3?
      • threat
        • 2.Qf2#
        • 2.Qe1#
        • 2.Qg3#
      • 1...Qxe4
        • 2.Qg3#
      • 1...Rxf4
        • 2.Qxf4#
        • 2.Qg3#
      • 1...Bxe4
        • 2.Qg3#
      • 1...Bc5
        • 2.Qg3#
      • 1...Qg6
        • 2.Sxg6#
      • 1...Bf3
        • 2.Qf2#
        • 2.Qe1#
      • 1...Sxe3!
    • 1.Qc3?
      • threat
        • 2.Qe1#
        • 2.Qg3#
      • 1...Qxe4
        • 2.Qg3#
      • 1...Rxf4
        • 2.Qg3#
      • 1...Bxe4
        • 2.Qg3#
      • 1...Bc5
        • 2.Qg3#
      • 1...Qg6
        • 2.Sxg6#
      • 1...Bf3
        • 2.Qe1#
      • 1...Sd2
        • 2.Qg3#
      • 1...Se3
        • 2.Qe1#
      • 1...bxc3!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Qe1#
      • 1...Qxe4
        • 2.Sg6#
      • 1...Rxf4
        • 2.Qxf4#
      • 1...Bxe4
        • 2.Sg2#
      • 1...Qg6
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(i);N_GUARD::S(F),XQ(i)
    • Q(i);N_GUARD::S(F)
    • R(j);OGATE,XS(F)::QAR2(A),XR(j)
    • B(a);N_GUARD::S(F),XB(a)
  • Tries
    • Try
      • R(B);XB(a)
      • Threat
        • DUALS(2)
      • Vars
        • R(j);OGATE,XS(F)::QAR2(A),XR(j)
        • Q(i);N_GUARD::S(F),XQ(i)
        • B(g);::S(F)
        • B(g);P_PINS(F)::QAB(A)
        • S(c);::QAB(A)
      • Refutation
        • Q(i);XS(E)
    • Try
      • R(B);
      • Threat
        • QAB(A)
      • Vars
        • Q(i);N_GUARD,XS(E)::R1(B),XP(e)
        • R(j);OGATE,XS(F)::QAR2(A),XR(j)
        • Q(i);N_GUARD::S(F),XQ(i)
      • Refutation
        • B(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • Q(i);XS(E)::QAB1(A)
        • B(a);XS(E)::QAB1(A)
        • B(g);::QAB1(A)
        • Q(i);N_GUARD::S(F),XQ(i)
      • Refutation
        • S(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);XS(E)::QAB1(A)
        • R(j);XS(F)::QAB1(A)
        • B(a);XS(E)::QAB1(A)
        • B(g);::QAB1(A)
        • Q(i);N_GUARD::S(F),XQ(i)
        • B(a);::QAB(A)
        • S(c);::QAB1(A)
        • S(c);::QAB(A)
      • Refutation
        • P(b);XQ(A)
  • Actual
    • R(B);
    • Threat
      • QAB(A)
    • Vars
      • Q(i);N_GUARD,XS(E)::S(F)
      • R(j);OGATE,XS(F)::QAR2(A),XR(j)
      • B(a);N_GUARD,XS(E)::S(F)
      • Q(i);N_GUARD::S(F),XQ(i)
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