MESON Chess Problem Database

Problem Display
PID: 83641 (1q2R3/3N2p1/5Pp1/r2pB1b1/4k1K1/5R2/1Np2P2/3b3Q w - - 0 1)

Ellerman, Arnoldo

Xadrez Brasileiro, 1936

1q2R3/3N2p1/5Pp1/r2pB1b1/4k1K1/5R2/1Np2P2/3b3Q

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Bc3#
    • 1...Qxb2
      • 2.Bxb2#
      • 2.Bc3#
    • 1...Qb3
      • 2.Bc3#
    • 1...Qb5
      • 2.Bc3#
    • 1...Qb7
      • 2.Bc3#
    • 1...Ra1
      • 2.Sc5#
    • 1...Ra2
      • 2.Sc5#
    • 1...Ra3
      • 2.Sc5#
    • 1...Ra4
      • 2.Sc5#
    • 1...Rc5
      • 2.Sxc5#
    • 1...Ra6
      • 2.Sc5#
    • 1...Ra7
      • 2.Sc5#
    • 1...Ra8
      • 2.Sc5#
    • 1...Bxf3+
      • 2.Qxf3#
  • Tries
    • 1.Bc3+?
      • 1...Qe5
        • 2.Rxe5#
      • 1...Qxe8!
    • 1.Qe1+?
      • 1...Be3
        • 2.Qxe3#
      • 1...Be2!
  • Keys
    • 1.Kg3!
      • threat
        • 2.Rf4#
      • 1...Bf4+
        • 2.Rxf4#
      • 1...Bh4+
        • 2.Qxh4#
      • 1...Qxb2
        • 2.Bxb2#
        • 2.Bc3#
      • 1...Bxf3
        • 2.Qxf3#
      • 1...Qb3
        • 2.Bc3#
      • 1...Ra3
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(i);N_GUARD::R(I)+B(F)
    • R(d);N_GUARD::S(H)
    • R(d);N_GUARD::S(H),XR(d)
    • B(a);CHECK,OGATE,P_SPINB(a),XR(D)::QAB1(A),XB(a)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • Q(i);N_GUARD,P_SPINQ(i)::R1(I),XQ(i)
      • Refutation
        • Q(i);XR(I)
    • Try
      • Q(A);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAR1(A),XB(f)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • K(E);N_SPINR(D),P-FLIGHT,P_SPINB(F)
    • Threat
      • QAB(A)+R(D),DCHECK
    • Vars
      • B(f);CHECK,N_PINB(F)::QAB(A)+R(D),DCHECK,XB(f)
      • B(f);CHECK,N_GUARD::QAR(A),XB(f)
      • B(a);OGATE,P_SPINB(a),XR(D)::QAB1(A),XB(a)
      • Q(i);N_PINB(F),P_PINR(D)::R(I)+B(F)
      • R(d);N_GUARD,P_PINR(D)::S(H)
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