MESON Chess Problem Database

Problem Display
PID: 206534 (Q7/8/2P2Bp1/2n2kPN/1nKpR3/3p1pr1/3P4/4b3 w - - 0 1)

Kalina, Vasily Emanuilovich

64 Shakhmatnoe obozrenie, 1925

Q7/8/2P2Bp1/2n2kPN/1nKpR3/3p1pr1/3P4/4b3

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rg4
      • 2.Re5#
    • 1...Bxd2
      • 2.Sxg3#
    • 1...Sxe4
      • 2.Qc8#
    • 1...f2
      • 2.Sxg3#
  • Tries
    • 1.Qb8?
      • threat
        • 2.Qf4#
        • 2.Qe5#
      • 1...Kxe4
        • 2.Qf4#
        • 2.Qe5#
      • 1...Bxd2
        • 2.Sxg3#
        • 2.Qe5#
      • 1...Sxc6
        • 2.Qf4#
      • 1...Sxe4
        • 2.Qc8#
      • 1...Rg4
        • 2.Re5#
        • 2.Qe5#
      • 1...Sd5
        • 2.Qe5#
      • 1...Se6
        • 2.Qe5#
      • 1...Sd7
        • 2.Qf4#
      • 1...gxh5!
    • 1.Qe8?
      • threat
        • 2.Sg7#
        • 2.Rf4#
        • 2.Qe5#
      • 1...Rxg5
        • 2.Rf4#
        • 2.Qe5#
      • 1...Bxd2
        • 2.Sxg3#
        • 2.Sg7#
        • 2.Qe5#
      • 1...Sxc6
        • 2.Sg7#
        • 2.Rf4#
      • 1...Sxe4
        • 2.Qd7#
        • 2.Qc8#
      • 1...Se6
        • 2.Qxe6#
      • 1...Rg4
        • 2.Sg7#
        • 2.Re5#
        • 2.Qe5#
      • 1...Sd5
        • 2.Sg7#
        • 2.Qe5#
      • 1...Sd7
        • 2.Sg7#
        • 2.Rf4#
        • 2.Qe6#
      • 1...gxh5!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Rf4#
      • 1...Kxe4
        • 2.Qxg6#
      • 1...Bxd2
        • 2.Sxg3#
      • 1...Sxe4
        • 2.Qc8#
      • 1...gxh5
        • 2.Qh7#
      • 1...Rg4
        • 2.Re5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(d);SBLOCK::R1(C)
    • B(a);N_GUARD,XP(A)::S(E),XR(d)
    • S(g);N_GUARD,SBLOCK,XR(C)::QAB(H)
    • P(c);S_CUTB(a)::S(E),XR(d)
  • Tries
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);XP(F)::QAR1(H)
        • S(g);N_GUARD,SBLOCK,XR(C)::QAB(H)
        • S(e);::QAR1(H)
        • S(g);::QAR1(H)
      • Refutation
        • P(i);XS(E)
    • Try
      • Q(H);
      • Threat
        • DUALS(3)
      • Vars
        • S(g);N_GUARD::QAB1(H),XS(g)
      • Refutation
        • P(i);XS(E)
  • Actual
    • Q(H);
    • Threat
      • R1(C)
    • Vars
      • K(h);S_FLIGHT,XR(C)::QAB(H),XP(i)
      • B(a);N_GUARD,XP(A)::S(E),XR(d)
      • S(g);N_GUARD,SBLOCK,XR(C)::QAB(H)
      • P(i);OGATEB,XS(E)::QAB(H)
      • R(d);SBLOCK::R1(C)
      • S(e);N_GUARD::QAR2(H),XS(e)
      • S(g);N_GUARD::QAB1(H),XS(g)
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