MESON Chess Problem Database

Problem Display
PID: 44687 (7n/3Q1p2/r1np1p2/p1P5/3NRpP1/Np1k4/1K6/2B4B w - - 0 1)

Zarhs, Aleksandr

1st HM., Olympic Ty., 1990

7n/3Q1p2/r1np1p2/p1P5/3NRpP1/Np1k4/1K6/2B4B

#2

9 + 10

3389 Belgian Solving Championship 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qb5#
    • 1...Se7
      • 2.Qb5#
    • 1...Sb8
      • 2.Qb5#
    • 1...Sd8
      • 2.Qb5#
    • 1...dxc5
      • 2.Sxc6#
  • Tries
    • 1.Sdc2?
      • threat
        • 2.Se1#
      • 1...f3
        • 2.Re3#
      • 1...bxc2!
    • 1.Se2?
      • threat
        • 2.Sxf4#
      • 1...f3
        • 2.Re3#
      • 1...Sg6!
    • 1.Sxc6?
      • threat
        • 2.Qxd6#
      • 1...f3
        • 2.Re3#
      • 1...d5
        • 2.Qxd5#
      • 1...Rxc6!
    • 1.Re1?
      • threat
        • 2.Rd1#
      • 1...Kxd4
        • 2.Qxd6#
      • 1...Sxd4
        • 2.Be4#
      • 1...f3!
    • 1.Re3+?
      • 1...Kxd4
        • 2.Qxd6#
      • 1...fxe3!
    • 1.Rxf4?
      • threat
        • 2.Qf5#
      • 1...Se7
        • 2.Qb5#
      • 1...f5
        • 2.Qxf5#
      • 1...Sxd4!
    • 1.Qf5?
      • threat
        • 2.Rxf4#
      • 1...Sxd4
        • 2.Re3#
      • 1...f3
        • 2.Rf4#
        • 2.Qxf3#
      • 1...Se7!
    • 1.Qxd6?
      • threat
        • 2.Sxc6#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...f3
        • 2.Re3#
      • 1...Se5
        • 2.Sc6#
      • 1...Sa7
        • 2.Sc6#
      • 1...Se7
        • 2.Qxa6#
      • 1...Sb8
        • 2.Sc6#
      • 1...Sd8
        • 2.Sc6#
        • 2.Qxa6#
      • 1...Sb4!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Se1#
      • 1...Kxe4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • S(f);OGATE::QAB(I)
    • P(g);XP(H)::QAR(I)+S(E),XS(f)
  • Tries
    • Try
      • S(E);P_PINP(g)
      • Threat
        • S(E)
      • Vars
        • P(c);N_GUARD::R1(F)
      • Refutation
        • P(a);XS(E)
    • Try
      • S(E);P_PINP(g)
      • Threat
        • S(E),XP(c)
      • Vars
        • P(c);N_GUARD::R1(F)
      • Refutation
        • S(j);
    • Try
      • S(E);P_PINP(g),XS(f)
      • Threat
        • QAR(I),XP(g)
      • Vars
        • P(c);N_GUARD::R1(F)
        • P(g);OGATE::QAR2(I),XP(g)
      • Refutation
        • R(e);XS(E)
    • Try
      • R(F);
      • Threat
        • R(F)
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(g),XS(E)::QAR2(I),XP(g)
        • S(f);SBLOCK,XS(E)::B(B)
      • Refutation
        • P(c);
    • Try
      • R(F);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINP(g),XS(E)::QAR2(I),XP(g)
      • Refutation
        • P(c);XR(F)
    • Try
      • R(F);XP(c)
      • Threat
        • QAB(I)
      • Vars
        • S(f);OGATE::QAB(I)
        • P(h);::QAB(I),XP(h)
      • Refutation
        • S(f);XS(E)
    • Try
      • Q(I);
      • Threat
        • QAB(I)+R(F),XP(c)
      • Vars
        • S(f);SBLOCK,XS(E)::QAB(I)+R(F),DCHECK
      • Refutation
        • S(f);
    • Try
      • Q(I);XP(g)
      • Threat
        • QAR(I)+S(E),XS(f)
      • Vars
        • S(f);OGATE,P_SPINS(f),XS(E)::QAR1(I),XS(f)
        • P(c);N_GUARD::R1(F)
        • S(f);::QAR(I)+S(E)
        • S(f);OGATE::QAB(I),XR(e)
      • Refutation
        • S(f);
  • Actual
    • S(E);P_PINP(g)
    • Threat
      • S(E)
    • Vars
      • K(b);N_SPINP(g),OGATEB,S_FLIGHT,XR(F)::QAB1(I)
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