MESON Chess Problem Database

Problem Display
PID: 206246 (n1q1B3/3R4/rP5p/7Q/k1N3KR/1p4P1/1P6/4B1n1 w - - 0 1)

Ellerman, Arnoldo

Brisbane Courier, 1933

n1q1B3/3R4/rP5p/7Q/k1N3KR/1p4P1/1P6/4B1n1

#2

10 + 7

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Rxb7#
    • 1...Qxd7+
      • 2.Bxd7#
    • 1...Qxc4+
      • 2.Rd4#
    • 1...Qc7
      • 2.Rxc7#
    • 1...Qb8
      • 2.Rd8#
    • 1...Qd8
      • 2.Rxd8#
    • 1...Ra5
      • 2.Qxa5#
    • 1...Rxb6
      • 2.Qa5#
  • Keys
    • 1.Sa3!
      • threat
        • 2.Qb5#
      • 1...Qxd7+
        • 2.Bxd7#
      • 1...Qc4+
        • 2.Rd4#
      • 1...Rxb6
        • 2.Qa5#
      • 1...Qc5
        • 2.Rd4#
      • 1...Qc6
        • 2.Rd4#
      • 1...Ra5
        • 2.Qxa5#
      • 1...Sc7
        • 2.Kf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(g);N_PINR(I)::B(J)+R(I),XQ(g)
    • Q(g);CHECK,OGATE,P_SPINQ(g),XR(I)::B(J),XQ(g)
    • Q(g);CHECK,N_PINR(I),XS(D)::B(J)+R(I)
    • Q(g);N_PINR(I)::B(J)+R(I)
    • R(d);N_GUARD::QAR1(G),XR(d)
    • R(d);N_GUARD,XP(H)::QAR1(G)
  • Actual
    • S(D);
    • Threat
      • QAB1(G)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XR(I)::B(J),XQ(g)
      • Q(g);CHECK,N_PINR(I)::B(J)+R(I)
      • R(d);N_GUARD,XP(H)::QAR1(G)
      • Q(g);N_PINR(I)::B(J)+R(I),DCHECK
      • Q(g);N_PINR(I)::R(I)
      • R(d);N_GUARD::QAR1(G),XR(d)
      • S(f);S_CUTQ(g)::R(F)+K(E)
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