MESON Chess Problem Database

Problem Display
PID: 244456 (4R1B1/2r1p1NK/1pPk3N/1Pr5/1PR5/5p2/3B3b/2Q3n1 w - - 0 1)

Eerkes, Allard Pieter

Norsk Sjakkblad, 1938

4R1B1/2r1p1NK/1pPk3N/1Pr5/1PR5/5p2/3B3b/2Q3n1

#2

11 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Sf7#
    • 1...Be5
      • 2.Shf5#
      • 2.Sgf5#
    • 1...e5
      • 2.Sf5#
  • Tries
    • 1.Shf5+?
      • 1...Ke5
        • 2.Bc3#
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Rxf5!
    • 1.Sgf5+?
      • 1...Ke5
        • 2.Bc3#
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Rxf5!
    • 1.Bf4+?
      • 1...Re5
        • 2.Shf5#
        • 2.Sgf5#
        • 2.Rd4#
        • 2.Qd2#
        • 2.Qd1#
      • 1...e5
        • 2.Sf5#
      • 1...Bxf4!
    • 1.Rd4+?
      • 1...Rd5
        • 2.Sf7#
        • 2.Rxd5#
      • 1...Ke5!
    • 1.Rd8+?
      • 1...Ke5
        • 2.Sg4#
        • 2.Bc3#
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Rd7!
    • 1.bxc5+?
      • 1...Ke5
        • 2.Sg4#
        • 2.Bc3#
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...bxc5!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Bf4#
      • 1...Ke5
        • 2.Bc3#
      • 1...Rd5
        • 2.Sf7#
      • 1...Bf4
        • 2.Bxf4#
      • 1...Be5
        • 2.Shf5#
        • 2.Sgf5#
      • 1...e5
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(d);SBLOCK::S(G)
    • P(h);P_PINS(H),S_CUTR(d)::S(G)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • R(d);XS(G)
    • Try
      • S(H);CHECK
      • Refutation
        • R(d);XS(H)
    • Try
      • B(B);CHECK
      • Vars
        • P(h);P_PINS(H),P_SPINP(h)::S(G)
      • Refutation
        • B(b);XB(B)
    • Try
      • R(D);CHECK
      • Refutation
        • K(f);P_SPINP(h),S_FLIGHT
    • Try
      • R(J);CHECK
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • P(C);CHECK,XR(d)
      • Refutation
        • P(e);XP(C)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+B(B),DCHECK
    • Vars
      • K(f);P_SPINP(h),S_FLIGHT::B(B)
      • R(d);SBLOCK::S(G)
      • B(b);::QAR(A)+B(B),DCHECK,XB(b)
      • P(h);P_PINS(H),S_CUTR(d)::S(G)
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