MESON Chess Problem Database

Problem Display
PID: 140298 (b4R2/1BKN4/2n5/1R1P4/r2Bk1p1/1N2p3/2r1P3/1Q2n3 w - - 0 1)

Birbrager, Isaak S

Shakhmaty v SSSR, 1949

b4R2/1BKN4/2n5/1R1P4/r2Bk1p1/1N2p3/2r1P3/1Q2n3

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sg2
      • 2.Qxc2#
    • 1...Sd3
      • 2.Qh1#
    • 1...Sf3
      • 2.Qxc2#
    • 1...Sb4+
      • 2.Sdc5#
    • 1...Sxd4+
      • 2.Sbc5#
    • 1...Sa5+
      • 2.Sdc5#
    • 1...Se5+
      • 2.Sdc5#
    • 1...Sa7+
      • 2.Sdc5#
    • 1...Se7+
      • 2.Sdc5#
    • 1...Sb8+
      • 2.Sdc5#
    • 1...Sd8+
      • 2.Sdc5#
  • Tries
    • 1.Kd6?
      • threat
        • 2.Sdc5#
      • 1...Sd3
        • 2.Qh1#
      • 1...Rc4!
    • 1.Qxc2+?
      • 1...Sd3
        • 2.Qxd3#
        • 2.exd3#
      • 1...Sxc2!
    • 1.dxc6?
      • threat
        • 2.Re5#
      • 1...Sd3
        • 2.Qh1#
      • 1...Sf3
        • 2.Qxc2#
      • 1...Ra5!
  • Keys
    • 1.Be5!
      • threat
        • 2.Rf4#
      • 1...Sb4+
        • 2.Sbc5#
      • 1...Sd4+
        • 2.Sbc5#
      • 1...Sa5+
        • 2.Sbc5#
      • 1...Sxe5+
        • 2.Sdc5#
      • 1...Sa7+
        • 2.Sbc5#
      • 1...Se7+
        • 2.Sbc5#
      • 1...Sb8+
        • 2.Sbc5#
      • 1...Sd8+
        • 2.Sbc5#
      • 1...Sg2
        • 2.Qxc2#
      • 1...Sd3
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAB(A),XR(b)
    • S(a);N_SPINR(b),OGATE::QAB(A)
    • S(g);CHECK::S(I)
    • S(g);CHECK,SBLOCK,XB(D)::S(C)
  • Tries
    • Try
      • K(H);S_FLIGHT
      • Threat
        • S(I)
      • Vars
        • S(a);N_SPINR(b),OGATE::QAB(A)
      • Refutation
        • R(d);
    • Try
      • Q(A);CHECK,XR(b)
      • Refutation
        • S(a);XQ(A)
    • Try
      • P(F);P_SPINP(F),XS(g)
      • Threat
        • R1(E)
      • Vars
        • S(a);N_SPINR(b),OGATE::QAB(A)
        • S(a);N_GUARD::QAB(A),XR(b)
      • Refutation
        • R(d);
  • Actual
    • B(D);
    • Threat
      • R1(J)
    • Vars
      • S(g);CHECK::S(C)
      • S(g);CHECK,SBLOCK,XB(D)::S(I)
      • S(a);N_GUARD::QAB(A),XR(b)
      • S(a);N_SPINR(b),OGATE::QAB(A)
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