MESON Chess Problem Database

Problem Display
PID: 200581 (5rb1/6N1/q2b3N/pP2n2r/R1P1kn1R/4p1P1/1B6/1K1Q4 w - - 0 1)

Pekelman, M

The Problemist, 1983

5rb1/6N1/q2b3N/pP2n2r/R1P1kn1R/4p1P1/1B6/1K1Q4

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rf7
      • 2.Qd5#
    • 1...Ra8
      • 2.Rxf4#
    • 1...Rb8
      • 2.Rxf4#
    • 1...Rc8
      • 2.Rxf4#
    • 1...Rd8
      • 2.Rxf4#
    • 1...Re8
      • 2.Rxf4#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Bf7
      • 2.Rxf4#
    • 1...Bh7
      • 2.Qd5#
    • 1...Sd3
      • 2.Qh1#
    • 1...Sf3
      • 2.Qc2#
    • 1...Sf7
      • 2.c5#
    • 1...e2
      • 2.Qxe2#
  • Tries
    • 1.Qc2+?
      • 1...Sd3
        • 2.Qg2#
      • 1...Kf3!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Rxf4#
        • 2.Qd5#
      • 1...Qxb5
        • 2.Sxd6#
        • 2.Rxf4#
      • 1...Rxh4
        • 2.Sg5#
      • 1...Rxf7
        • 2.Qd5#
      • 1...Bxf7
        • 2.Rxf4#
      • 1...Sxc4
        • 2.Rxc4#
      • 1...Sxf7
        • 2.c5#
      • 1...e2
        • 2.Qxe2#
      • 1...Qb7
        • 2.Sxd6#
        • 2.Rxf4#
      • 1...Qc6
        • 2.Rxf4#
      • 1...Qa8
        • 2.Sxd6#
        • 2.Rxf4#
      • 1...Rf5
        • 2.Qd5#
      • 1...Sd3
        • 2.Qh1#
      • 1...Sf3
        • 2.Qc2#
      • 1...Sg4
        • 2.c5#
      • 1...Sc6
        • 2.Sxd6#
      • 1...Sg6
        • 2.c5#
      • 1...Sd7
        • 2.c5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 7
  • Sets
    • R(i);S_CUTB(j)::QAB1(B)
    • R(i);N_GUARD::R1(G),XS(c)
    • B(j);N_GUARD::QAB1(B),XB(j)
    • B(j);S_CUTR(i)::R1(G),XS(c)
    • B(j);N_GUARD::QAB1(B)
    • S(e);N_GUARD,SBLOCK::QAB(B)
    • S(e);N_GUARD,S_CUTB(j)::R(E)+P(F)
    • P(a);OGATEB::QAR2(B),XP(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(e);N_GUARD,N_SPINS(c),P_SPINS(e),SBLOCK::QAB(B)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
  • Actual
    • S(I);
    • Threat
      • DUALS(2)
    • Vars
      • R(f);N_GUARD,N_SPINS(c),XR(G)::S(I)
      • R(i);XS(I)::QAB1(B)
      • B(j);XS(I)::R1(G),XS(c)
      • S(e);N_SPINS(c),OGATE,P_SPINS(e),XP(F)::R(E),XS(e)
      • S(e);N_GUARD,XS(I)::R(E)+P(F)
      • P(a);OGATEB::QAR2(B),XP(a)
      • Q(g);::R1(G),XS(c)
      • R(f);::QAB1(B)
      • S(e);N_GUARD,SBLOCK::QAB(B)
      • S(e);N_GUARD,N_SPINS(c)::R(E)+P(F)
      • S(e);S_CUTQ(g)::S(I),XB(h)
      • S(e);N_GUARD::R(E)+P(F)
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