MESON Chess Problem Database

Problem Display
PID: 107134 (7B/3p2n1/3p4/3k4/Bp4P1/1P3K2/2P2QP1/4R3 w - - 0 1)

Sonnenfeld, Felix Alexander

Xadrez Brasileiro, 1943

7B/3p2n1/3p4/3k4/Bp4P1/1P3K2/2P2QP1/4R3

#2

9 + 5

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sh5
      • 2.Qd4#
    • 1...Se8
      • 2.Qd4#
  • Tries
    • 1.Kg3?
      • 1...Sf5+
        • 2.Qxf5#
      • 1...Se6
        • 2.Qf5#
      • 1...Se8
        • 2.Qd4#
        • 2.Qf5#
      • 1...Sh5+!
    • 1.Qb6?
      • 1...Sf5
        • 2.Qa5#
        • 2.Qb5#
      • 1...Sh5
        • 2.Qd4#
        • 2.Qa5#
        • 2.Qb5#
      • 1...Se8
        • 2.Qd4#
        • 2.Qa5#
        • 2.Qb5#
      • 1...Se6!
    • 1.Qa7?
      • 1...Sf5
        • 2.Qa5#
      • 1...Sh5
        • 2.Qd4#
        • 2.Qa5#
      • 1...Se8
        • 2.Qd4#
        • 2.Qa5#
      • 1...Se6!
    • 1.Qf1?
      • threat
        • 2.Qc4#
      • 1...Kd4
        • 2.Qc4#
      • 1...Kc5!
    • 1.Qe2?
      • threat
        • 2.Qc4#
      • 1...Kd4
        • 2.Qc4#
      • 1...Kc5!
    • 1.c3?
      • threat
        • 2.Qd4#
        • 2.c4#
      • 1...Sf5
        • 2.c4#
      • 1...Se6
        • 2.c4#
      • 1...bxc3!
  • Keys
    • 1.Ke3!
      • 1...Sf5+
        • 2.Qxf5#
      • 1...Kc5
        • 2.Ke4#
      • 1...Ke5
        • 2.Qf5#
      • 1...Ke6
        • 2.Kd4#
      • 1...Sh5
        • 2.Qf5#
      • 1...Se6
        • 2.Qf5#
      • 1...Se8
        • 2.Qf5#

This anticipates 214055(1955)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(e);::QAR1(C)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Vars
        • S(e);CHECK,N_GUARD::QAR2(C),XS(e)
        • S(e);N_GUARD::QAR2(C)
      • Refutation
        • S(e);CHECK
    • Try
      • Q(C);
      • Refutation
        • S(e);
    • Try
      • Q(C);
      • Vars
        • S(e);::QAR(C)
      • Refutation
        • S(e);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT,P_SPINS(e)::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT,P_SPINS(e)::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);::P(B)
      • Refutation
        • P(a);XP(B)
  • Actual
    • K(F);P-FLIGHT
    • Vars
      • S(e);CHECK,N_GUARD::QAR2(C),XS(e)
      • K(b);P-FLIGHT::QAB(C)+K(F)
      • K(b);P-FLIGHT,P_SPINS(e)::QAR1(C)
      • K(b);S_FLIGHT::R(A)+K(F)
      • S(e);N_GUARD::QAR2(C)
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