MESON Chess Problem Database

Problem Display
PID: 180391 (7b/3KQ3/8/3N4/1P1kpN2/1P4rR/1pPp1p2/3n2n1 w - - 0 1)

Lider, Valentin Viktorovich

Deutsche Schachblatter, 1984

7b/3KQ3/8/3N4/1P1kpN2/1P4rR/1pPp1p2/3n2n1

#2

8 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qc5#
    • 1...Bf6
      • 2.Qxf6#
    • 1...Se3
      • 2.c3#
  • Tries
    • 1.Se2+?
      • 1...Kxd5
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qe6#
        • 2.c4#
      • 1...Sxe2!
    • 1.Se6+?
      • 1...Kxd5
        • 2.Qc5#
        • 2.Qd6#
      • 1...Ke5!
    • 1.Sf6?
      • threat
        • 2.Qc5#
      • 1...Kc3
        • 2.Qc5#
      • 1...Ke3
        • 2.Qxe4#
      • 1...Rg5
        • 2.Qxe4#
      • 1...Rc3
        • 2.Qd6#
        • 2.Qxe4#
      • 1...Rg7!
    • 1.Qd6?
      • threat
        • 2.Se6#
      • 1...Rg7+
        • 2.Se7#
      • 1...Rxb3
        • 2.Sb6#
      • 1...Rg6
        • 2.Sf6#
      • 1...e3!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Qc5#
      • 1...Kxc3
        • 2.Qc5#
      • 1...Ke3
        • 2.Qxe4#
      • 1...Rxc3
        • 2.Qd6#
      • 1...Rg5
        • 2.Qxe4#
      • 1...Rg7
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • B(i);SBLOCK::QAB1(H)
    • B(i);N_GUARD::QAB(H),XB(i)
    • S(a);N_GUARD,S_CUTR(f)::P(A)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • S(b);XS(E)
    • Try
      • S(E);CHECK
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(F);
      • Threat
        • QAB1(H)
      • Vars
        • K(g);P_SPINR(f),S_FLIGHT::QAR2(H)
        • K(g);P_SPINP(h),P_SPINR(f),S_FLIGHT::QAR1(H),XP(h)
        • R(f);::QAR1(H),XP(h)
      • Refutation
        • R(f);P_PINQ(H)
    • Try
      • Q(H);
      • Threat
        • S(E)
      • Vars
        • R(f);CHECK::QAR(H)+S(F)
        • R(f);XP(B)::QAR(H)+S(F)
        • R(f);::QAR(H)+S(F)
      • Refutation
        • P(h);
  • Actual
    • S(F);
    • Threat
      • QAB1(H)
    • Vars
      • K(g);P_SPINR(f),S_FLIGHT,XS(F)::QAR2(H)
      • K(g);P_SPINP(h),P_SPINR(f),S_FLIGHT::QAR1(H),XP(h)
      • R(f);XS(F)::QAR2(H)
      • R(f);::QAR1(H),XP(h)
      • R(f);P_PINQ(H)::S(F)
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