MESON Chess Problem Database

Problem Display
PID: 119150 (3r4/3pPp2/2p1NQb1/q1Bk1N1R/1p2pK2/pP2Pn2/B7/8 w - - 0 1)

Yakovlev, Yuri Nikolayevich

Canadian Chess Chat, 1980

3r4/3pPp2/2p1NQb1/q1Bk1N1R/1p2pK2/pP2Pn2/B7/8

#2

10 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5
      • 2.Sc7#
    • 1...Se1
      • 2.Qe5#
    • 1...Sg1
      • 2.Qe5#
    • 1...Sd2
      • 2.Qe5#
    • 1...Sh2
      • 2.Qe5#
    • 1...Sd4
      • 2.Qe5#
    • 1...Sh4
      • 2.Qe5#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sg5
      • 2.Qe5#
  • Tries
    • 1.Qd4+?
      • 1...Kxe6
        • 2.Sg7#
        • 2.Qd6#
      • 1...Sxd4!
    • 1.exd8Q?
      • threat
        • 2.Se7#
        • 2.Qxd7#
      • 1...Qxd8
        • 2.Se7#
      • 1...Qxc5
        • 2.Sc7#
      • 1...Bxf5
        • 2.Qxd7#
      • 1...fxe6
        • 2.Se7#
      • 1...Qa7
        • 2.Se7#
      • 1...Se5
        • 2.Se7#
        • 2.Qxe5#
      • 1...d6
        • 2.Se7#
        • 2.Qxd6#
      • 1...Qc7+!
    • 1.exd8R?
      • threat
        • 2.Se7#
        • 2.Rxd7#
      • 1...Qxd8
        • 2.Se7#
      • 1...Qxc5
        • 2.Sc7#
      • 1...Bxf5
        • 2.Rxd7#
      • 1...fxe6
        • 2.Se7#
      • 1...Qa7
        • 2.Se7#
      • 1...Se5
        • 2.Se7#
        • 2.Qxe5#
      • 1...d6
        • 2.Se7#
        • 2.Rxd6#
      • 1...Qc7+!
    • 1.e8S?
      • threat
        • 2.Se7#
      • 1...Qc7+
        • 2.S8xc7#
      • 1...Bxf5!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qc4#
      • 1...Qc7+
        • 2.Sxc7#
      • 1...Kxe6
        • 2.Sg7#
      • 1...Qxc5
        • 2.Sc7#
      • 1...bxc3
        • 2.b4#
      • 1...Qb5
        • 2.Sc7#
      • 1...Qa6
        • 2.Sc7#
      • 1...Sd2
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • Q(e);N_GUARD,SBLOCK,XB(E)::S(H)
    • S(b);N_GUARD::QAR1(I)
    • S(b);N_GUARD::QAR1(I),XS(b)
  • Tries
    • Try
      • Q(I);CHECK
      • Refutation
        • S(b);XQ(I)
    • Try
      • P(J);P_PINP(i),XR(k)
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);N_SPINP(i),XQ(J)::R(G)+S(F),DCHECK
        • Q(e);N_GUARD,SBLOCK,XB(E)::S(H)
        • B(h);P_SPINB(h),XS(F)::QAR2(J),XP(i)
        • P(j);XS(H)::R(G)+S(F),DCHECK
        • Q(e);::R(G)+S(F),DCHECK
      • Refutation
        • Q(e);CHECK
    • Try
      • P(J);P_PINP(i),XR(k)
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);N_SPINP(i),XR(J)::R(G)+S(F),DCHECK
        • Q(e);N_GUARD,SBLOCK,XB(E)::S(H)
        • B(h);P_SPINB(h),XS(F)::R(J),XP(i)
        • P(j);XS(H)::R(G)+S(F),DCHECK
        • Q(e);::R(G)+S(F),DCHECK
      • Refutation
        • Q(e);CHECK
    • Try
      • P(J);
      • Threat
        • R(G)+S(F),DCHECK
      • Vars
        • Q(e);CHECK,N_GUARD::S(J),XQ(e)
      • Refutation
        • B(h);P_SPINB(h),XS(F)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • Q(e);CHECK,N_GUARD::S(H),XQ(e)
      • K(f);S_FLIGHT,XS(H)::S(F)
      • Q(e);N_GUARD,XB(E)::S(H)
      • P(c);OGATE,XQ(I)::B(A)+P(B)
      • Q(e);N_GUARD::S(H)
      • S(b);N_GUARD::QAR1(I)
      • S(b);N_GUARD::QAR1(I),XS(b)
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