MESON Chess Problem Database

Problem Display
PID: 201771 (2R5/8/7q/3P4/1pN1p2b/1Bk1P1nb/2P1PQ1B/R3K1N1 w Q - 0 1)

Hjelle, David

Land og Folk, 1966

2R5/8/7q/3P4/1pN1p2b/1Bk1P1nb/2P1PQ1B/R3K1N1

#2

12 + 7

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3
      • 2.Qxe3#
    • 1...Sf1
      • 2.Be5#
    • 1...Sh1
      • 2.Be5#
    • 1...Sxe2
      • 2.Sxe2#
    • 1...Sh5
      • 2.Be5#
  • Tries
    • 1.Kd1?
      • threat
        • 2.Qe1#
      • 1...Qxe3
        • 2.Qxe3#
      • 1...Sxe2
        • 2.Sxe2#
      • 1...Sf1
        • 2.Be5#
      • 1...Sh1
        • 2.Be5#
      • 1...Sh5
        • 2.Be5#
      • 1...Sf5!
    • 1.Sb2+?
      • 1...Qc6
        • 2.Sd1#
        • 2.Sa4#
      • 1...Bxc8
        • 2.Sd1#
        • 2.Sa4#
      • 1...Kxb2!
    • 1.Sb6+?
      • 1...Qc6
        • 2.Sa4#
      • 1...Bxc8
        • 2.Sa4#
      • 1...Kb2!
  • Keys
    • 1.0-0-0!
      • threat
        • 2.Qe1#
      • 1...Qxe3+
        • 2.Qxe3#
      • 1...Sxe2+
        • 2.Sxe2#
      • 1...Sf1
        • 2.Be5#
      • 1...Sh1
        • 2.Be5#
      • 1...Sf5
        • 2.Sd6#
      • 1...Sh5
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE,P_PINP(E),XP(I)::QAR2(F),XQ(g)
    • S(b);OGATE,P_PINQ(F)::B(G)
    • S(b);P_PINQ(F),XP(E)::S(C),XS(b)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • QAB(F)
      • Vars
        • Q(g);OGATE,XP(I)::QAR2(F),XQ(g)
        • S(b);XP(E)::S(C),XS(b)
        • S(b);OGATE::B(G)
      • Refutation
        • S(b);
    • Try
      • S(J);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(J)
    • Try
      • S(J);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::S(J)
        • B(c);XR(L)::S(J)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • K(B);0-0-0,P_SPINP(I)
    • Threat
      • QAB(F)
    • Vars
      • Q(g);CHECK,OGATE,XP(I)::QAR2(F),XQ(g)
      • S(b);CHECK,XP(E)::S(C),XS(b)
      • S(b);OGATE::B(G)
      • S(b);S_CUTB(c)::R(L)+S(J)
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