MESON Chess Problem Database

Problem Display
PID: 52596 (b7/8/R1p5/4p1Q1/2nkP3/P7/2R1K3/1B6 w - - 0 1)

Sonnenfeld, Felix Alexander

Boletim da UBP, 1964

b7/8/R1p5/4p1Q1/2nkP3/P7/2R1K3/1B6

#2

7 + 5

5309 O Mosqueteiro do Rei 1997
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Rd2#
    • 1...Kc5
      • 2.Qxe5#
    • 1...Sb2
      • 2.Qe3#
    • 1...Sd2
      • 2.Qe3#
    • 1...Sxa3
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sa5
      • 2.Qe3#
    • 1...Sb6
      • 2.Qe3#
    • 1...Sd6
      • 2.Qe3#
  • Tries
    • 1.Ba2?
      • threat
        • 2.Rxc4#
      • 1...Kc5
        • 2.Qxe5#
      • 1...Sxa3
        • 2.Qe3#
      • 1...Sb2
        • 2.Qe3#
      • 1...Sd2
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sa5
        • 2.Qe3#
      • 1...Sb6
        • 2.Qe3#
      • 1...Sd6
        • 2.Qe3#
      • 1...Kxe4!
    • 1.Ra4?
      • threat
        • 2.Rcxc4#
        • 2.Raxc4#
        • 2.Qe3#
      • 1...Kxe4
        • 2.Rd2#
      • 1...Kc5!
    • 1.Rxc6?
      • threat
        • 2.R2xc4#
        • 2.R6xc4#
      • 1...Kxe4
        • 2.Rd2#
      • 1...Sxa3
        • 2.Rd2#
        • 2.Qe3#
      • 1...Sb2
        • 2.Qe3#
      • 1...Sd2
        • 2.Rxd2#
        • 2.Qe3#
      • 1...Se3
        • 2.Rd2#
        • 2.Qxe3#
      • 1...Sa5
        • 2.Rd2#
        • 2.Qe3#
      • 1...Sb6
        • 2.Rd2#
        • 2.Qe3#
      • 1...Sd6
        • 2.Rd2#
        • 2.Qe3#
      • 1...Bxc6!
    • 1.Qg1+?
      • 1...Se3
        • 2.Ra4#
        • 2.Qxe3#
      • 1...Kxe4!
    • 1.Qg3?
      • 1...Kxe4
        • 2.Rd2#
      • 1...Kc5
        • 2.Qxe5#
      • 1...Sxa3
        • 2.Qd3#
        • 2.Qe3#
      • 1...Sb2
        • 2.Qe3#
      • 1...Sd2
        • 2.Qd3#
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sa5
        • 2.Qd3#
        • 2.Qe3#
      • 1...Sb6
        • 2.Qd3#
        • 2.Qe3#
      • 1...Sd6
        • 2.Qd3#
        • 2.Qe3#
      • 1...c5
        • 2.Qd3#
      • 1...Bb7!
  • Keys
    • 1.Qd8+!
      • 1...Kxe4
        • 2.Rxc4#
      • 1...Kc5
        • 2.Ra5#
      • 1...Sd6
        • 2.Ra4#

This anticipates 54620(1970)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • K(b);P-FLIGHT,XP(E)::B(A)+R(B)
    • K(b);P_SPINP(c),P_SPINS(a),S_FLIGHT::QAR2(F),XP(c)
    • S(a);N_GUARD::QAB1(F)
    • S(a);N_GUARD,XP(D)::QAB1(F)
    • S(a);N_GUARD::QAB1(F),XS(a)
  • Tries
    • Try
      • B(A);
      • Threat
        • R1(B),XS(a)
      • Vars
        • K(b);P_SPINP(c),P_SPINS(a),S_FLIGHT::QAR2(F),XP(c)
        • S(a);N_GUARD,XP(D)::QAB1(F)
        • S(a);N_GUARD::QAB1(F)
        • S(a);N_GUARD::QAB1(F),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XP(E)
    • Try
      • R(G);P_PINS(a)
      • Threat
        • DUALS(3)
      • Vars
        • K(b);P-FLIGHT,XP(E)::B(A)+R(B)
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT
    • Try
      • R(G);XP(d)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT,XP(E)::B(A)+R(B)
        • S(a);N_GUARD::QAB1(F)
      • Refutation
        • B(e);XR(G)
    • Try
      • Q(F);CHECK
      • Refutation
        • K(b);P-FLIGHT,XP(E)
    • Try
      • Q(F);
      • Vars
        • K(b);P-FLIGHT,XP(E)::B(A)+R(B)
        • K(b);P_SPINS(a),S_FLIGHT::QAR2(F),XP(c)
        • S(a);N_GUARD::QAB1(F)
        • S(a);N_GUARD::QAB1(F),XS(a)
        • P(d);SBLOCK::QAR1(F)
      • Refutation
        • B(e);
  • Actual
    • Q(F);CHECK
    • Vars
      • K(b);P-FLIGHT,XP(E)::B(A)+R(B),DCHECK,XS(a)
      • K(b);P_SPINS(a),S_FLIGHT::R(G)
      • S(a);P_SPINS(a)::R(G)
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