MESON Chess Problem Database

Problem Display
PID: 160993 (b1B1N3/1Q2p3/4n3/2RqPk2/2p1n1R1/4B2P/3PN3/K7 w - - 0 1)

Back, Par-Erik

Norsk Sjakkblad, 1937

b1B1N3/1Q2p3/4n3/2RqPk2/2p1n1R1/4B2P/3PN3/K7

#2

11 + 7

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Rxd5#
    • 1...Qc6
      • 2.Sd4#
      • 2.Sg7#
    • 1...Qxb7
      • 2.Sd4#
      • 2.Sg7#
    • 1...Qxd2
      • 2.Sg7#
    • 1...Qd3
      • 2.Sg7#
    • 1...Qd4+
      • 2.Sxd4#
    • 1...Qxe5+
      • 2.Sd4#
    • 1...Qd6
      • 2.Sg7#
    • 1...Qd8
      • 2.Sg7#
  • Tries
    • 1.Sg3+?
      • 1...Kxe5
        • 2.Rxe4#
        • 2.Rxd5#
      • 1...Sxg3!
    • 1.Sd4+?
      • 1...Kxe5
        • 2.Rxd5#
      • 1...Qxd4+!
    • 1.Qxd5?
      • threat
        • 2.Sd4#
        • 2.Sg7#
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Sxc5
        • 2.Sg3#
        • 2.Sd4#
        • 2.Sg7#
        • 2.Rg5#
      • 1...Sg5
        • 2.Rxg5#
      • 1...Bxd5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Rg5#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Qxe5+
        • 2.Sd4#
      • 1...Kxe5
        • 2.Qxe4#
      • 1...Qd7
        • 2.Sg3#
      • 1...Qd3
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(d);N_SPINS(e),OGATEB,P-FLIGHT,P_SPINQ(c),XP(H)::R1(G),XQ(c)
    • Q(c);XP(B)::S(K)
    • Q(c);::S(K)
    • Q(c);CHECK,N_GUARD::S(C),XQ(c)
    • Q(c);CHECK,N_GUARD,P_SPINQ(c),XP(H)::S(C)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • S(b);XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • K(d);N_SPINS(e),P-FLIGHT,P_SPINQ(c),XP(H)::R1(G),XQ(c)
      • Refutation
        • Q(c);CHECK,XS(C)
    • Try
      • Q(I);XQ(c)
      • Threat
        • DUALS(4)
      • Vars
        • S(b);N_GUARD::R1(F),XS(b)
      • Refutation
        • B(g);XQ(I)
  • Actual
    • Q(I);N_PINS(e),P_PINS(b)
    • Threat
      • R1(F)
    • Vars
      • Q(c);CHECK,N_GUARD::S(C),XQ(c)
      • Q(c);CHECK,N_GUARD,P_SPINQ(c),XP(H)::S(C)
      • K(d);N_SPINS(b),P-FLIGHT,P_SPINQ(c),XP(H)::QAR1(I),XS(b)
      • Q(c);::S(C)
      • Q(c);N_SPINS(b),P_SPINS(e)::S(K)
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