MESON Chess Problem Database

Problem Display
PID: 71661 (2n5/Bp1Q1p2/1r1N3K/R2b3R/pn1kP3/2p1p3/q1p5/2N2B2 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

2nd Prize, Pravda Vostoka, 1928

2n5/Bp1Q1p2/1r1N3K/R2b3R/pn1kP3/2p1p3/q1p5/2N2B2

#2

9 + 12

14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Se2#
    • 1...Se7
      • 2.Bxb6#
    • 1...f5
      • 2.Qg7#
  • Tries
    • 1.Qf5?
      • threat
        • 2.Qe5#
        • 2.Qf6#
      • 1...Sxd6
        • 2.Bxb6#
        • 2.Qe5#
      • 1...e2
        • 2.Qf2#
      • 1...Sd3
        • 2.Se2#
      • 1...f6
        • 2.Qxf6#
      • 1...Sc6!
    • 1.Qe7?
      • threat
        • 2.Qf6#
        • 2.Qe5#
      • 1...Sxd6
        • 2.Bxb6#
        • 2.Qe5#
      • 1...Sxe7
        • 2.Bxb6#
      • 1...Be6
        • 2.Qf6#
      • 1...Sd3
        • 2.Se2#
      • 1...Sc6
        • 2.Sb5#
        • 2.Sf5#
      • 1...f5
        • 2.Qf6#
        • 2.Qg7#
      • 1...f6
        • 2.Sb5#
        • 2.Sf5#
        • 2.Qxf6#
      • 1...e2!
  • Keys
    • 1.Qg4!
      • threat
        • 2.exd5#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Sxd6
        • 2.Bxb6#
      • 1...e2
        • 2.Qg1#
      • 1...f5
        • 2.Qg7#
      • 1...Bb3
        • 2.e5#
      • 1...Bc4
        • 2.e5#
      • 1...Bc6
        • 2.Sf5#
      • 1...Be6
        • 2.Sb5#
      • 1...Sd3
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • S(f);SBLOCK::S(A)
    • S(l);N_GUARD::B(H),XR(i)
    • P(k);OGATE::QAB(I)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);OGATEB::QAB(I)
        • S(f);SBLOCK::S(A)
        • P(k);N_PINS(F)::QAB(I),XP(k)
      • Refutation
        • S(f);N_PINS(F)
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • S(l);N_GUARD,XQ(I)::B(H),XR(i)
        • B(h);N_PINS(F)::QAB(I)
        • S(f);SBLOCK::S(A)
      • Refutation
        • P(d);
  • Actual
    • Q(I);
    • Threat
      • QAR(I)+P(C),XB(h)
    • Vars
      • B(h);OGATE,P_SPINB(h),XP(C)::QAR1(I),XB(h)
      • S(l);N_GUARD,XS(F)::B(H),XR(i)
      • P(d);OGATEB::QAB(I)
      • P(k);N_GUARD::QAB(I)
      • B(h);N_GUARD::QAR(I)+P(C)
      • B(h);N_PINS(F)::S(F)
      • S(f);SBLOCK::S(A)
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