MESON Chess Problem Database

Problem Display
PID: 199752 (7n/1b2p3/1B2RrB1/1PKp2b1/rp2p3/1RnPk2N/pQ3NP1/8 w - - 0 1)

Paalanen, Erkki

Suomen Shakki, 1989

7n/1b2p3/1B2RrB1/1PKp2b1/rp2p3/1RnPk2N/pQ3NP1/8

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Sd1#
      • 2.Sg4#
    • 1...Sd1
      • 2.Sxd1#
      • 2.Sg4#
    • 1...Se2
      • 2.Sd1#
      • 2.Sg4#
    • 1...Sxb5
      • 2.Sd1#
      • 2.Sg4#
  • Tries
    • 1.Bxe4?
      • threat
        • 2.Sg4#
      • 1...Sxe4+
        • 2.dxe4#
      • 1...Rxf2
        • 2.Qxf2#
      • 1...dxe4
        • 2.Kc4#
      • 1...Rf4!
    • 1.Rxc3?
      • threat
        • 2.Sd1#
        • 2.Sg4#
      • 1...Rxf2
        • 2.Qxf2#
      • 1...a1Q
        • 2.Sg4#
      • 1...a1R
        • 2.Sg4#
      • 1...Rf4
        • 2.Sd1#
      • 1...bxc3!
    • 1.Rxe4+?
      • 1...Sxe4+
        • 2.dxe4#
      • 1...dxe4!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Qd2#
      • 1...Sxe4+
        • 2.dxe4#
      • 1...Kxd3
        • 2.Sef2#
      • 1...dxe4
        • 2.Kc4#
      • 1...Rf2
        • 2.Sxc3#
      • 1...Sb1
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(K);XP(f)
      • Threat
        • S(B)
      • Vars
        • S(b);CHECK,OGATE,P_SPINS(b),XB(K)::R(D)+P(E),XS(b)
        • R(i);OGATE,XS(B)::QAB1(A),XR(i)
        • P(g);P_SPINP(g),XB(K)::B(I)+K(H)
      • Refutation
        • R(i);
    • Try
      • R(D);XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(i);OGATE,XS(B)::QAB1(A),XR(i)
        • P(a);::S(B)
        • R(i);::S(B)
      • Refutation
        • P(e);XR(D)
    • Try
      • R(J);CHECK,XP(f)
      • Vars
        • S(b);CHECK,OGATE,XR(J)::R(D)+P(E),XS(b)
      • Refutation
        • P(g);XR(J)
  • Actual
    • S(B);XP(f)
    • Threat
      • QAB1(A)
    • Vars
      • S(b);CHECK,OGATE,P_SPINS(b),XS(B)::R(D)+P(E),XS(b)
      • K(c);P-FLIGHT,P_SPINS(b),XP(E)::B(K)+S(B),DCHECK
      • P(g);P_SPINP(g),XS(B)::B(I)+K(H)
      • R(i);N_GUARD::R(J)+S(B),XS(b)
      • S(b);N_GUARD::R(J)+S(B),XR(i)
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