MESON Chess Problem Database

Problem Display
PID: 138298 (4NR1B/K2Q4/p1P5/4P1p1/q1n1knP1/7R/B2p1Pp1/3rrbbN w - - 0 1)

Kovalev, N

6th HM., Aleshin MT, 1947

4NR1B/K2Q4/p1P5/4P1p1/q1n1knP1/7R/B2p1Pp1/3rrbbN

#2

12 + 12

14752 Soviet Chess Compositions (1945-1947) 1949

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf2+
      • 2.Sxf2#
    • 1...Se3
      • 2.f3#
    • 1...Sxe5
      • 2.Sf6#
    • 1...Se2
      • 2.Qd3#
    • 1...Sd3
      • 2.Sg3#
    • 1...Sxh3
      • 2.Sg3#
    • 1...Se6
      • 2.Sg3#
    • 1...Sg6
      • 2.Sg3#
  • Tries
    • 1.Rxf4+?
      • 1...Kxf4
        • 2.Qf5#
      • 1...gxf4!
  • Keys
    • 1.e6!
      • threat
        • 2.Qd4#
      • 1...Bxf2+
        • 2.Sxf2#
      • 1...Sxe6
        • 2.Sg3#
      • 1...Sb2
        • 2.Sd6#
      • 1...Sa3
        • 2.Sd6#
      • 1...Se3
        • 2.f3#
      • 1...Sa5
        • 2.Sd6#
      • 1...Se5
        • 2.Sf6#
      • 1...Sb6
        • 2.Sd6#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Se2
        • 2.Qd3#
      • 1...Sd5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • B(d);CHECK,XP(C)::S(A),XB(d)
    • S(h);N_PINP(C),SBLOCK::P(C)
    • S(h);SBLOCK,XP(F)::S(J)
    • S(j);N_GUARD,S_CUTB(c)::QAB1(I)
    • S(j);::S(A)
    • S(j);XR(D)::S(A)
  • Tries
    • Try
      • R(K);CHECK,XS(j)
      • Vars
        • K(i);P-FLIGHT,XR(K)::QAR1(I)
      • Refutation
        • P(k);XR(K)
  • Actual
    • P(F);
    • Threat
      • QAR1(I)
    • Vars
      • B(d);CHECK,XP(C)::S(A),XB(d)
      • S(j);XP(F)::S(A)
      • S(h);N_GUARD::S(J)
      • S(h);N_PINP(C),SBLOCK::P(C)
      • S(h);SBLOCK::S(J)
      • S(h);N_GUARD,N_PINP(C)::S(J)
      • S(h);N_GUARD::S(J),XS(h)
      • S(j);N_GUARD,S_CUTB(c)::QAB1(I)
      • S(j);N_GUARD,SBLOCK::QAB(I)
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