MESON Chess Problem Database

Problem Display
PID: 180225 (n1Q3B1/8/3k2N1/5P2/2p4p/n2b1Nq1/3R1PPB/3K4 w - - 0 1)

Lider, Valentin Viktorovich

2nd HM., Problemas, 1973

n1Q3B1/8/3k2N1/5P2/2p4p/n2b1Nq1/3R1PPB/3K4

#2

10 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Bxf4#
    • 1...Qe5
      • 2.Bxe5#
    • 1...c3
      • 2.Rxd3#
    • 1...h3
      • 2.Bxg3#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Qc6#
      • 1...Bc2+
        • 2.Sxc2#
      • 1...Be2+
        • 2.Sxe2#
      • 1...Be4
        • 2.Sb5#
      • 1...Sc7!
    • 1.fxg3?
      • threat
        • 2.gxh4#
        • 2.g4#
      • 1...hxg3
        • 2.Bxg3#
      • 1...h3
        • 2.g4#
      • 1...Sc7!
  • Keys
    • 1.Sfe5!
      • threat
        • 2.Qc6#
      • 1...Qf3+
        • 2.Sxf3#
      • 1...Qg4+
        • 2.Sxg4#
      • 1...Qxe5
        • 2.Bxe5#
      • 1...Qxg2
        • 2.Sxc4#
      • 1...Qxg6
        • 2.Sxg6#
      • 1...Sc7
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(c);OGATE::B(E),XQ(c)
    • P(d);N_GUARD::R(B),XB(b)
    • P(e);N_GUARD::B(E),XQ(c)
  • Tries
    • Try
      • S(F);N_PINB(b)
      • Threat
        • QAR1(I)
      • Vars
        • B(b);CHECK::R(B)+S(F),XB(b)
        • B(b);::R(B)+S(F),DCHECK
      • Refutation
        • S(g);
    • Try
      • P(C);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(e);OGATE,P_SPINP(e),XP(C)::B(E),XP(e)
        • P(e);::B(E)+P(C)
      • Refutation
        • S(g);
  • Actual
    • S(F);N_PINQ(c)
    • Threat
      • QAR1(I)
    • Vars
      • Q(c);CHECK::B(E)+S(F),XQ(c)
      • Q(c);OGATE,P_SPINQ(c),XS(F)::B(E),XQ(c)
      • Q(c);XP(D)::B(E)+S(F),DCHECK,XP(d)
      • Q(c);XS(H)::B(E)+S(F),XQ(c)
      • S(g);SBLOCK::QAB(I)
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