MESON Chess Problem Database

Problem Display
PID: 89785 (1b1R3B/8/BN1r1PQK/4r2p/1P1knP2/N1p2n2/2p1Rp2/3b4 w - - 0 1)

Eerkes, Allard Pieter

Die Schwalbe, 1948

1b1R3B/8/BN1r1PQK/4r2p/1P1knP2/N1p2n2/2p1Rp2/3b4

#2

11 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Rb5
      • 2.Qxe4#
    • 1...Rc5
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Red5
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Rg5
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Bxe2
      • 2.Sxc2#
    • 1...Sd2
      • 2.Qd3#
    • 1...Sg3
      • 2.Qd3#
    • 1...Sc5
      • 2.Sb5#
    • 1...Sg5
      • 2.Qd3#
    • 1...Sxf6
      • 2.Qd3#
  • Tries
    • 1.Sb5+?
      • 1...Rxb5
        • 2.Qxe4#
      • 1...Kd3!
    • 1.Rxd6+?
      • 1...Rd5
        • 2.Rxe4#
        • 2.Rxd5#
        • 2.Qxe4#
      • 1...Sxd6
        • 2.Qd3#
      • 1...Bxd6!
  • Keys
    • 1.f7!
      • threat
        • 2.Rxe4#
      • 1...Bxe2
        • 2.Sxc2#
      • 1...Sfd2
        • 2.Bxe5#
      • 1...Sfg5
        • 2.Bxe5#
      • 1...Sed2
        • 2.Sb5#
      • 1...Sg3
        • 2.Sb5#
      • 1...Sc5
        • 2.Sb5#
      • 1...Seg5
        • 2.Sb5#
      • 1...Sf6
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(h);N_GUARD::QAR1(H),XS(g)
    • B(a);N_GUARD,XR(A)::S(B),XP(b)
    • S(g);OGATE::QAR1(H)
    • S(g);S_CUTR(h)::S(B)
    • S(g);OGATE,XP(G)::QAR1(H)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • R(h);XS(B)::QAR1(H),XS(g)
      • Refutation
        • K(f);P-FLIGHT,P_SPINS(g)
    • Try
      • R(J);CHECK,XR(j)
      • Vars
        • S(g);OGATE,XR(J)::QAR1(H)
      • Refutation
        • B(k);XR(J)
  • Actual
    • P(G);N_PINR(j),P_PINR(h),P_SPINQ(H)
    • Threat
      • R1(A),XS(g)
    • Vars
      • B(a);N_GUARD,XR(A)::S(B),XP(b)
      • S(e);N_GUARD::B(K),XR(h)
      • S(g);::S(B)
      • S(g);N_PINQ(H),N_SPINR(h),P_SPINR(j)::QAR1(H)
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