MESON Chess Problem Database

Problem Display
PID: 28349 (8/8/1Q5B/2p1KB2/1p6/3N4/p1N1R3/1k4r1 w - - 0 1)

Lider, Valentin Viktorovich

2nd Prize, Nedeljski Dnevnik, 1970-1974

8/8/1Q5B/2p1KB2/1p6/3N4/p1N1R3/1k4r1

#2

7 + 5

3771 FIDE Album (1974-1976) 1980
3242 BCPS Rapid Solving (Cheltenham) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...a1S
      • 2.Sa3#
    • 1...b3
      • 2.Qxb3#
    • 1...c4
      • 2.Qxg1#
      • 2.Qxb4#
  • Tries
    • 1.Sdxb4?
      • threat
        • 2.Sd3#
        • 2.Sd5#
        • 2.Sa6#
        • 2.Sc6#
      • 1...a1Q+
        • 2.Sd4#
      • 1...a1B+
        • 2.Sd4#
      • 1...Kb2
        • 2.Sd5#
      • 1...cxb4
        • 2.Qxb4#
      • 1...Rg5
        • 2.Sd3#
      • 1...a1S
        • 2.Sa3#
      • 1...a1R
        • 2.Se1#
        • 2.Sa3#
        • 2.Sd4#
      • 1...Rg3
        • 2.Sd3#
      • 1...Rg6
        • 2.Sc6#
      • 1...Rg4!
  • Keys
    • 1.Scxb4!
      • threat
        • 2.Sc2#
      • 1...a1Q+
        • 2.Sb2#
      • 1...a1B+
        • 2.Sb2#
      • 1...Ka1
        • 2.Sc2#
      • 1...cxb4
        • 2.Qxg1#
      • 1...a1S
        • 2.Rb2#
      • 1...a1R
        • 2.Sc1#
        • 2.Se1#
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sxc5#
        • 2.Sa2#
        • 2.Sd5#
        • 2.Sa6#
        • 2.Sc6#
        • 2.Rb2#
      • 1...Rg4
        • 2.Re1#
      • 1...Rg6
        • 2.Re1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • P(c);SBLOCK::S(A)
    • P(d);OGATE::QAR2(F),XP(d)
  • Tries
    • Try
      • S(C);XP(d)
      • Threat
        • DUALS(4)
      • Vars
        • P(c);CHECK,SBLOCK::B(E)+S(A)
        • K(a);P-FLIGHT::QAR(F)+S(C)
        • P(e);OGATE,P_SPINP(e),XS(C)::QAR(F),XP(e)
        • R(b);P_PINB(E)::QAR(F)+S(C)
        • P(c);SBLOCK::B(E)+S(A),DCHECK
        • R(b);::QAR(F)+S(C)
      • Refutation
        • R(b);
  • Actual
    • S(A);XP(d)
    • Threat
      • QAR(F)+S(A)
    • Vars
      • P(c);CHECK,SBLOCK::B(E)+S(C)
      • K(a);P-FLIGHT::S(A)
      • P(e);OGATE,P_SPINP(e),XS(A)::QAR(F),XR(b)
      • P(c);SBLOCK::R1(B)
      • R(b);N_GUARD::R(B)
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