MESON Chess Problem Database

Problem Display
PID: 177835 (8/p1P2B2/3PN1b1/1P1k1P2/R1N1p1pQ/qP1n1n2/1p6/3R3K w - - 0 1)

Markovsky, Grigory F

Sahs (Latvia), 1983

8/p1P2B2/3PN1b1/1P1k1P2/R1N1p1pQ/qP1n1n2/1p6/3R3K

#2

12 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Rxd3+?
      • 1...Sd4
        • 2.Rxd4#
      • 1...exd3!
    • 1.Qf2?
      • threat
        • 2.Sf4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...e3!
    • 1.Qg3?
      • threat
        • 2.Se3#
      • 1...e3
        • 2.Sxe3#
      • 1...Se5
        • 2.Qxe5#
      • 1...Qc5!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qa8#
      • 1...Qxd6
        • 2.Se3#
      • 1...Qc5
        • 2.Sf4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Se5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);CHECK,XS(c)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::R1(A),XS(d)
      • Refutation
        • P(e);XR(A)
    • Try
      • Q(F);
      • Threat
        • B(L)+S(J),DCHECK
      • Vars
        • S(d);N_GUARD,N_SPINS(c)::QAR1(F),XS(d)
      • Refutation
        • P(e);
    • Try
      • Q(F);
      • Threat
        • S(E)
      • Vars
        • P(e);::S(E),XP(e)
        • S(d);N_GUARD::QAR1(F),XS(d)
      • Refutation
        • Q(b);
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • Q(b);SBLOCK,XP(I)::S(E)
      • Q(b);SBLOCK::B(L)+S(J),DCHECK
      • S(d);N_GUARD,N_SPINS(c)::QAR1(F),XS(d)
      • S(d);N_GUARD::QAR1(F),XS(d)
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