MESON Chess Problem Database

Problem Display
PID: 207463 (5N1b/5N2/1p1R4/1Q2pkB1/2P2n2/1K1pq1pP/3P4/1B3R2 w - - 0 1)

Ellerman, Arnoldo

Il Problema, 1931

5N1b/5N2/1p1R4/1Q2pkB1/2P2n2/1K1pq1pP/3P4/1B3R2

#2

11 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Bxd3#
      • 2.Rxf4#
    • 1...Qe1
      • 2.Rxf4#
    • 1...Qe2
      • 2.Rxf4#
    • 1...Qe4
      • 2.Qd7#
  • Tries
    • 1.Bxd3+?
      • 1...Qe4
        • 2.Rxf4#
        • 2.Qd7#
      • 1...Qxd3+!
    • 1.Rf6+?
      • 1...Ke4
        • 2.Qxe5#
      • 1...Bxf6!
  • Keys
    • 1.Rxd3!
      • threat
        • 2.Rxe3#
      • 1...Qxd3+
        • 2.Bxd3#
      • 1...Ke4
        • 2.Sd6#
      • 1...Qxd2
        • 2.Rxd2#
      • 1...Qg1
        • 2.Rxf4#
        • 2.Rc3#
        • 2.Re3#
        • 2.Rdf3#
        • 2.Rxg3#
        • 2.Rd4#
        • 2.Rd5#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Rd8#
      • 1...Qf2
        • 2.Rf3#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Qc5
        • 2.Rd5#
      • 1...Qe1
        • 2.Rxf4#
      • 1...Qe2
        • 2.Rxf4#
      • 1...Qf3
        • 2.Rdxf3#
      • 1...Qe4
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD::R1(B),XS(d)
    • Q(b);N_SPINP(a),P_SPINP(e),SBLOCK::QAB(G)
  • Tries
    • Try
      • B(A);CHECK,P_PINP(e),P_SPINB(A),XP(a)
      • Refutation
        • Q(b);CHECK,XB(A)
    • Try
      • R(I);CHECK
      • Vars
        • K(f);N_SPINS(d),S_FLIGHT::QAR1(G),XP(e)
      • Refutation
        • B(h);XR(I)
  • Actual
    • R(I);P_PINP(e),P_SPINR(I),XP(a)
    • Threat
      • B(A)+R(I),XQ(b)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XR(I)::B(A),XQ(b)
      • K(f);N_SPINP(e),N_SPINS(d),S_FLIGHT::S(J)
      • Q(b);N_PINR(I),XP(C)::B(A)+R(I),XQ(b)
      • Q(b);N_PINR(I),N_SPINS(d)::B(A)+R(I)
      • Q(b);N_PINR(I)::B(A)+R(I),XQ(b)
      • Q(b);N_PINR(I),N_SPINP(e)::B(A)+R(I)
      • Q(b);N_GUARD,N_PINR(I)::R1(B),XS(d)
      • Q(b);N_SPINS(d)::B(A)+R(I),XQ(b)
      • Q(b);N_PINR(I),SBLOCK::QAB(G)
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