MESON Chess Problem Database

Problem Display
PID: 133261 (nq6/2p1RB2/r1nB2p1/2pN1pKp/2Pk1Pb1/7r/2R2P1P/2N4Q w - - 0 1)

Eyjolfsson, Eyjolfur

4th Prize, The Problemist, 1987/I

nq6/2p1RB2/r1nB2p1/2pN1pKp/2Pk1Pb1/7r/2R2P1P/2N4Q

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.fxe3#
    • 1...Sb4
      • 2.Be5#
    • 1...Sa5
      • 2.Be5#
    • 1...Se5
      • 2.Bxe5#
    • 1...Sa7
      • 2.Be5#
    • 1...Sxe7
      • 2.Be5#
    • 1...Sd8
      • 2.Be5#
  • Tries
    • 1.Se2+?
      • 1...Kd3
        • 2.Qd1#
      • 1...Bxe2!
    • 1.Sc3?
      • threat
        • 2.Qd5#
      • 1...Sxe7
        • 2.Be5#
      • 1...Rf3
        • 2.S3e2#
      • 1...Sb4
        • 2.Be5#
      • 1...Sb6
        • 2.Sb5#
      • 1...Bf3!
    • 1.Qd1+?
      • 1...Rd3
        • 2.Qxd3#
      • 1...Bxd1!
  • Keys
    • 1.Sb4!
      • threat
        • 2.Qd5#
      • 1...Sxb4
        • 2.Be5#
      • 1...Sxe7
        • 2.Be5#
      • 1...Bf3
        • 2.Sb3#
      • 1...Rf3
        • 2.Se2#
      • 1...Sb6
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(a);OGATE::P(D),XR(a)
    • S(h);N_GUARD::B(J)
    • S(h);N_GUARD::B(J),XS(h)
    • S(h);N_GUARD,XR(K)::B(J)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • B(c);XS(A)
    • Try
      • S(H);
      • Threat
        • QAR1(B)
      • Vars
        • S(h);N_GUARD,XR(K)::B(J)
        • R(a);S_CUTB(c)::S(H)
        • S(h);N_GUARD::B(J)
        • S(k);S_CUTQ(l)::S(H)
      • Refutation
        • B(c);
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(B),XR(a)
      • Refutation
        • B(c);XQ(B)
  • Actual
    • S(H);
    • Threat
      • QAR1(B)
    • Vars
      • S(h);N_GUARD,XS(H)::B(J)
      • S(h);N_GUARD,XR(K)::B(J)
      • B(c);S_CUTR(a)::S(A)
      • R(a);S_CUTB(c)::S(A)
      • S(k);S_CUTR(g)::S(H),XS(h)
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