MESON Chess Problem Database

Problem Display
PID: 46526 (2B2q2/r1b2nN1/4RQ2/r7/1R1B1NkP/p4ppp/8/K2n4 w - - 0 1)

Pilchenko, Viacheslav Karlovich

Shavirin, Valery Mikhailovich

3rd Prize, 64 Shakhmatnoe obozrenie, 1999

2B2q2/r1b2nN1/4RQ2/r7/1R1B1NkP/p4ppp/8/K2n4

#2

9 + 11

4393 Uralski Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.Re5#
    • 1...Qc5
      • 2.Re5#
    • 1...Qxg7
      • 2.Re5#
    • 1...Ra4
      • 2.Re8#
    • 1...Se5
      • 2.Qg5#
  • Tries
    • 1.Sg6?
      • threat
        • 2.Re4#
      • 1...Qxg7
        • 2.Re5#
      • 1...Qxc8
        • 2.Be5#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Re5
        • 2.Qf4#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Be5
        • 2.Qf5#
      • 1...Se5
        • 2.Qg5#
      • 1...g2!
    • 1.Re4+?
      • 1...Rf5
        • 2.Bxf5#
      • 1...Qxc8!
    • 1.Qf5+?
      • 1...Kxh4
        • 2.Sg6#
      • 1...Rxf5!
  • Keys
    • 1.Sg2!
      • threat
        • 2.Re4#
      • 1...Qxg7
        • 2.Re5#
      • 1...Qxc8
        • 2.Be5#
      • 1...Re5
        • 2.Qf4#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Be5
        • 2.Qf5#
      • 1...Se5
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(k);N_GUARD,XR(B)::B(I)+R(F)
    • Q(k);N_GUARD::B(I)+R(F)
    • Q(k);N_GUARD,XS(H)::B(I)+R(F)
    • R(g);N_GUARD::B(I)+R(F)
    • S(j);N_GUARD,S_CUTR(g)::QAR1(G)
  • Tries
    • Try
      • S(D);
      • Threat
        • B(I)+R(F),DCHECK
      • Vars
        • Q(k);N_GUARD,XS(H)::B(I)+R(F)
        • Q(k);N_GUARD,XB(I)::R(B)+B(C)
        • R(g);N_GUARD::QAB1(G),XR(g)
        • R(g);S_CUTB(i)::QAR1(G)
        • B(i);N_GUARD::QAR1(G),XB(i)
        • B(i);P_PINB(C),S_CUTR(g)::QAB1(G)
        • S(j);N_GUARD,S_CUTR(g)::QAR1(G)
      • Refutation
        • P(d);
    • Try
      • R(F);CHECK
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::B(I),XR(g)
      • Refutation
        • Q(k);XB(I)
    • Try
      • Q(G);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(E)::S(D)
      • Refutation
        • R(g);XQ(G)
  • Actual
    • S(D);
    • Threat
      • B(I)+R(F),DCHECK
    • Vars
      • Q(k);N_GUARD,XS(H)::B(I)+R(F)
      • Q(k);N_GUARD,XB(I)::R(B)+B(C)
      • R(g);S_CUTB(i)::QAR1(G)
      • R(g);N_GUARD::QAB1(G),XR(g)
      • B(i);N_GUARD::QAR1(G),XB(i)
      • B(i);P_PINB(C),S_CUTR(g)::QAB1(G)
      • S(j);N_GUARD,S_CUTR(g)::QAR1(G)
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