MESON Chess Problem Database

Problem Display
PID: 221885 (7B/2p2q2/Nprpp1N1/3kPn2/6Rn/2pB2p1/K3Pbr1/7Q w - - 0 1)

Hjelle, David

Suomen Shakki, 1952

7B/2p2q2/Nprpp1N1/3kPn2/6Rn/2pB2p1/K3Pbr1/7Q

#2

9 + 13

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Sb4#
    • 1...Bd4
      • 2.Sf4#
    • 1...Bc5
      • 2.Bc4#
    • 1...Sxg6
      • 2.Qxg2#
    • 1...Sd4
      • 2.e4#
  • Tries
    • 1.Rd4+?
      • 1...Bxd4
        • 2.Sf4#
      • 1...Sxd4
        • 2.e4#
      • 1...Kxd4!
    • 1.Qxg2+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sxg2!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Bc4#
      • 1...Rc4
        • 2.Be4#
      • 1...Rc5
        • 2.Sb4#
      • 1...Bd4
        • 2.Sf4#
      • 1...Sd4
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(i);SBLOCK::S(G)
    • B(a);P_PINP(C),SBLOCK::S(H)
    • B(a);P_PINP(C),S_CUTR(i)::B(D)
    • S(e);N_GUARD,XS(H)::QAB(A),XR(b)
    • S(g);SBLOCK::P(C)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • B(a);P_PINP(C),SBLOCK,XR(E)::S(H)
        • S(g);SBLOCK,XR(E)::P(C)
      • Refutation
        • K(f);N_SPINR(b),P-FLIGHT,XR(E)
    • Try
      • Q(A);CHECK,XR(b)
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAB(A),XS(e)
      • Refutation
        • S(e);XQ(A)
  • Actual
    • Q(A);N_PINR(b)
    • Threat
      • QAR(A)+B(D),DCHECK
    • Vars
      • R(i);SBLOCK::QAR(A)+B(D),DCHECK
      • R(i);SBLOCK::S(G)
      • B(a);P_PINP(C),SBLOCK::S(H)
      • S(g);SBLOCK::P(C)
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