MESON Chess Problem Database

Problem Display
PID: 87507 (6Q1/8/5P2/R3pPK1/1q2k2p/2nnN3/2N3P1/3R4 w - - 0 1)

Eerkes, Allard Pieter

American Chess Problemist, 1950

6Q1/8/5P2/R3pPK1/1q2k2p/2nnN3/2N3P1/3R4

#2

9 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qc4#
    • 1...Qxa5
      • 2.Qc4#
    • 1...Qe7
      • 2.Qc4#
    • 1...Qf8
      • 2.Qc4#
    • 1...Qb1
      • 2.Qc4#
    • 1...Qb2
      • 2.Qc4#
    • 1...Qc4
      • 2.Qxc4#
    • 1...Qb7
      • 2.Qc4#
    • 1...Qb8
      • 2.Qc4#
    • 1...Sb1
      • 2.Qd5#
    • 1...Sxd1
      • 2.Qd5#
    • 1...Sa2
      • 2.Qd5#
    • 1...Se2
      • 2.Qd5#
    • 1...Sa4
      • 2.Qd5#
    • 1...Sb5
      • 2.Qd5#
      • 2.Qa8#
    • 1...Sd5
      • 2.Qxd5#
  • Tries
    • 1.Rxe5+?
      • 1...Kxe5
        • 2.Qe6#
      • 1...Sxe5!
    • 1.Qa8+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...Qb7!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sd2#
      • 1...Qxc4
        • 2.Qxc4#
      • 1...Sxd1
        • 2.Qd5#
      • 1...Sb1
        • 2.Qd5#
      • 1...Sa2
        • 2.Qd5#
      • 1...Se2
        • 2.Qd5#
      • 1...Sa4
        • 2.Qd5#
      • 1...Sb5
        • 2.Qa8#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sc1
        • 2.Rxe5#
      • 1...Se1
        • 2.Rxe5#
      • 1...Sb2
        • 2.Rxe5#
      • 1...Sf2
        • 2.Rxe5#
      • 1...Sf4
        • 2.Rxe5#
      • 1...Sc5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 8
  • Sets
    • Q(c);N_GUARD::QAR2(I)
    • Q(c);N_GUARD,XR(E)::QAR2(I)
    • Q(c);N_GUARD,P_PINP(H)::QAR2(I)
    • Q(c);N_GUARD::QAR2(I),XQ(c)
    • S(a);N_GUARD::QAB1(I)
    • S(a);N_GUARD,XR(A)::QAB1(I)
    • S(a);N_GUARD::QAB1(I),XS(a)
  • Tries
    • Try
      • R(E);CHECK,XP(f)
      • Vars
        • K(d);P-FLIGHT,XR(E)::QAR1(I)
      • Refutation
        • S(b);XR(E)
    • Try
      • Q(I);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(I),XS(a)
      • Refutation
        • Q(c);P_SPINQ(c)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • Q(c);OGATE,XS(D)::QAR2(I),XQ(c)
      • S(a);N_GUARD,XR(A)::QAB1(I)
      • S(a);N_GUARD::QAB1(I)
      • S(a);N_GUARD,S_CUTQ(c)::QAB(I)
      • S(a);N_GUARD::QAB1(I),XS(a)
      • S(b);N_GUARD::R1(E),XP(f)
      • S(b);S_CUTQ(c)::S(D)
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